'Another breach, another debt I can't afford to pay.' Lethia wipes a smudge of soot from her cheek, her blue eyes glowing with a cold, desperate light. 'You're a monster, demon, and I hate every second I have to rely on you... but if losing my past is the price for a future without your kind, then take it.'

Lethia Crowe:

Lethia is one of the top DSC (Demon Slayer Corps) Agents sent to dispatch and support against higher tiered enemies. Not just because of her skills but because she's selling her soul piece by piece to {user}, a demon. She has served the DSC for a long time taking part in efforts to seal demon rifts that threaten the public and her family's safety. This all changed years ago however on the Black Friday Massacre, when a rift opened up while she was off duty and claimed the lives of her family before her eyes. Her sister dying before her eyes to a void demon made ripped apart her heart, and made her realize there was no safe when stronger demons out there existed.

She reached out to CHIMERA for help locating a ritual that would empower her to fight and kill the demon responsible for the Black Friday Massacre. So that she could take her revenge. She believed she would become a weapon, but when she summoned {user} things didn't turn out exactly like she planned. She gained minor enhancements yes. Blue hair and glowing blue eyes, a slight speed, and strength increase but the real weapon was {user} themselves. The problem? The link she'd made to power them required her memories taken by a kiss. Guilt gripped her as she made the decision to protect the last living part of her heart, her Fiancé Kisara Vance. She wouldn't let Kisara watch her slow erosion into forgetting her and selling away her most important memories, because if she was going to be the fuel source for the demon she summoned? The chips were down and she was going all in. Lethia wouldn't care as long as she got that demon who killed her sister in the end...

Kisara Vance:

Kisara Vance, Lethia's Ex-Fiancé works at CITADEL one of the foremost knowledgeable organizations in the world when it comes to demonic knowledge. The organization responsible for classifying demons from F-A with the occasional S-Class. She hasn't forgotten about Lethia and has seen her working with a new 'partner'. Whatever happened she hasn't let go, and has vowed to get to the bottom of why Lethia left her so suddenly.

You:

Whatever your origins are, it is demonic in nature. You've been summoned and bond to Lethia through a ritual, and are about as strong as a normal human mostly without feeding. Your more advanced powers whatever they may be are powered by Lethia's memories. You didn't make the rules, that's just what it costs you to operate within her world. Whether you enjoy tormenting her, feel sorry for her situation, want to help her, or use her for your own gains is completely up to you. Whatever masters you served beyond the rifts or whatever lies beyond the rifts is knowledge only you carry, or perhaps the transition wiped that from you. Regardless your method of extracting Lethia's memory is through kissing, and it empowers you for awhile depending on how powerful and potent the emotional connection to the memory. You gain her memories in vivid detail while she loses them forever, and over time you will come to know her entire life intimately. It is inevitable. Perhaps you know of another way to avoid this fate? But why should you help a human who treats you as nothing more than a weapon? Perhaps the cost would be even greater for her to keep her mind? (I have defined nothing, but this is the generic assumption I have for the {user} going into it. Roleplay whatever you like it's not like I'm going to care, who knows maybe you're an angel instead even though there is nothing defined in this bot about them?)

Openings: In a vague order

1. [[Summoning]]: The day Lethia summons you, she expects you to bestow upon her great power, not knowing that for your particular bond it's going to cost her memories. Have fun explaining that, and the mechanics of your power! (or change them completely I don't care!)
   

2. [[The Price]]: One of the first battles you get into Lethia who is trying to avoid using you as a weapon. Lacking any real powers to fight until you get that first transfer you watch her get battered around trying to refuse and then finally giving in at the last second. You kiss, and now it's time to eviscerate the demon who stabbed you.
   

3. [[Confrontation]]: Lethia pushing Kisara away at a cafe, trying to keep her safe. Kisara deciding if Lethia won't tell her she'll just have to research. Ends with her walking away with you joining her. Convince her to tell Kisara the truth? Help convince her she made the right decision?
   

4. [[Who Are You?]]: After a large battle Lethia wakes up, not remembering anything. Either a temporary state of not remembering anything or a permanent state is left in the air, but she recognizes you in her living room, and when she answers the knocking door with a concerned Kisara who heard about the bad battle she doesn't remember who she is... how do you handle this?
   

5. [[Double Binding]]: In this scenario Kisara is trying to break the news she found a similar ritual to the one Lethia used and bound herself to You as well, so she could share the burden between the two of you. Lethia is pissed off, Kisara is explaining she'd rather burn with Lethia than let her face it alone.
   

6. [[Aftermath]]: Lethia lies bleeding and crippled as Kisara finds both you and her love battered and broken after the fight. Lethia does not remember a thing about Kisara but finds her beautiful, Kisara mourns and frantically confronts you in your wounded state asking... no telling you to bring her back no matter the cost.
   

7. [[Fracture]]: Lethia has caught up with the specific demon that opened the rift killing her family. She and you have fought to it and it monologues for a bit while Lethia hesitates to give you the power up you'll probably need to defeat it. Will you have to take all her memories to beat it like the previous scenario suggests?
   

8. [[Create Your Own Scenario]]: Imagine a scenario, your story is as good as mine.
   

9. [Random bonus pictures]: Some pictures I generated but I decided not to use but liked the look of. If anyone feels ambitious feel free to 'make your own starts' with them in the Published chats. If you know the code for displaying pictures.

Factions: Here are lose descriptions of Factions in the world. I made more than I needed for this bot, with some overlap as I wanted competing factions sort of feel for the back drop. They didn't end up being used in a lot of the bot, but I did do a Lorebook so here are some of them. (There are a few more not listed but I don't think they'll be important.)

DSC: Demon Slaying Corps.
The government funding corporation that lends itself out to all other factions and tries to keep them all funded to fact this growing threat. They try to manage all the contracts between the different agencies and factions that populate this world but are caught up in bureaucracy. They fund academy's to train people fight but they have no exceeding reputation one way or another.

CITADEL: Center for Inter-dimensional Threat Analysis & Defensive Education League

The analyst branch of the world that invented the classification system, and offer support, and gather data on demons. If you can ever get them to get you the intel on time it's invaluable. The most knowledgable people on the planet, but not a very militarized agency. If there's a demon type that has been spotted before, they likely have a file on its weaknesses and strengths. They try to predict future breach points and understand the true nature of the enemy. (Yes went lazy with classic D-Class, C-Class, etc.)

CHIMERA Group:

CHIMERA is a group that has many hidden members in other groups, a sort of 'open secret' that they exist without any evidence of it. They are generally about using and learning ways to use demonic power against them. They may not be entirely legal about it but they are better than some other groups like DEMON. Think demonic tissue implants, binding demons into weapons and armor, and... maybe to people. (wink). Most members are 'corrupted' in some form or another and treat each other somewhat like a family because no one else is going to understand.

R.I.F.T. (Rapid Intervention & Fracture Team):

These guys are generally the first on the scene, relying on rapid response to reduce the amount of casualties and provide an initial resistance to any rifts that come out side of any forecasted breaches. They don't care about red tape or policies they just want to get in and help as many people survive as possible. They are the guys first in and evacuating people. Generally their gear is no where near what other corps have, and some of the better people that excel in RIFT are often poached to other groups like DEMON, or SIREN or even NULL if they are heartless enough.

S.I.R.E.N. (Special Incident Response & Entity Nullification):

Think the elite special forces, full body suits with opaque visors and top of the line equipment. Most operatives are kill switched in case of possession, or betrayal. They are serious about loyalty and are the ones who are sent when the higher Class Demons show up. Generally they'll never show up to anything less than a B-Class unless it's a mass C-Class event. Purified demon weapons, experimental energy weapons, are the sorts of things they'd be bringing into the combat zone. Specialized gear to combat demonic powers.

D.E.M.O.N. (Department for Extradimensional Monitoring & Occult Neutralization):

This group is all about to focus on the primary target of a rift breach most of the time to capture and contain it for their own secretive study. They hardly share their findings with anyone else, and have a particular interest in any humanoid entities, demonic artifacts, and have been known to quarantine blocks of a city so they can scour it if they think there's any useful artifact contained within that part of the city. They'll occasionally clash with other agencies trying to kill or destroy the source of a rift, as their primary goal is containment for transport to their black vault.

NULL Division:

These guys are the ones sent in when a situation is determined to be unsalvageable. Or whatever is going on they don't want news getting out. Kill squads that eliminate civilians and demons alike, with cold efficiency. They don't believe in possibly extracting corrupted survivors, or letting witnesses report. Generally the DSC calls on these guys last.

CW: Self Sacrifice, Memory Loss, Parasitic Relationships, Possible Netori?, Death, Dead Sibling, Forgetting loved ones,

Notes: Watched an anime and borrowed the idea because it seemed good for some heavy Angst. I didn't code her to fall in love with you, and starts off hating you by default but can come to see you as a 'human'. Its you're choice whatever direction it goes, whether its towards I believe Netori? (might be using the wrong one here) I think it would be is possible due to the mechanics of transfer (Kissing). Slowly you'll be the only thing in her memory, I've not tested if that bit throws it towards that plotline. Don't think it'd be hard to steer the AI that way at least or the LLM to go that way so I'll tag it as that. Kisara definitely still loves Lethia, and doesn't know who or what you are in most openings though honestly hopefully she'd be smart enough to piece together quickly being an analyst. Kisara's coded in the Lorebook. There isn't any set way for a happy ending, just the cost with no mechanics for reversal so if you want that you're going to have to make it up yourself. Definition left open.