Important note: The character you see in the image is you.

So what happened?

Worldbuilding:

In your previous life, towers appeared from the ground. Monsters came out of them every month. At first, the cities were surprised, but luckily there weren ́t many monsters, so the number of casualties were low. After defeating and killing the first wave of monsters -that look like werewolf- an angel appeared out of the sky. I quote:

"Humans, god has given you enough time to prepare for battle. He has always protected you from all the atrocities beyond this world, but even he can no longer keep you all alive. So in order to save you all and give you a fighting chance, he gifted you all the towers. Enter the tower, climb and conquer its floors. You may preserve on those floor for your entire life if you wish so, but understand if no one conquers a floor in the span of a year the towers protection will wear off and monsters shall rain upon this lands. The tower is connected to the outer worlds. Those who climb the tower shall receive immense powers to protect the world. The system will guide you all and reward you with the items you will need for your adventures. I wish you all the best of luck. We are deeply sorry, that we are putting you guys through this trial, but there were no other options."

and then the angel dissapeared.

This message flicked a sign of hope into the people ́s heart. Many started to rush in into the tower, gaining a level up system, a guide on how to get stronger and how to clear the floors. The government tried their best to stop people from entering recklessly, but they didn ́t listen. This was their one way trip in order to get stronger, make more money and be powerful like all those fictional characters in those novels. Little did they know the tower was not so friendly. At first, people died, because they walked into traps or fought many monsters at once. But eventually, they realised their weakness and joined groups. This allowed them to conquer the first floor after 3 days have passed. People were gaining levels fast, growing stronger, and getting more powerful weapons. In just the span of 1 month, they pushed up to the 10th floor with over 100 people already dead. Humans became smarter and learned that they need to prepare before they can go up and finish a floor. And just like that, humans who came out of the tower were called explorer. People that have surpassed human limits, and can fight on even grounds with monsters. 2 months have passed since the towers arrive and already 40% of humanity is living inside the towers. They only come out to either see their families, do bussinesses or fight the 1 month cycle monsters that rains from the sky. And thus agencies were founded to support explorers in order to use the strenght for themself.

about your past life and the you now: In your past life, you were a normal student, named itou. When the towers appeared, you hide in a safe spot and even managed to backstab a monster. Then came the angels speech and the tower was open. As a gamer who has a lot of experience when it comes to rpgs, this was gold. You could finally escape this painful and harsh work life. So you entered the tower as quick as possible. You registered yourself as an explorer, gained the level-up system and venture out to conquer floors. At first it was difficult, but your quick thinking, and way of analyzing situations to your advantage helped you clear the first floor with some other dudes. Your level rised with every death of a monster. Just like that 10 years have passed. You ́re now one of the top explorer in the world. Currently placed as top 3 in the whole world. And when you guys tried to beat the 100th floor, your party came into contact with a five headed dragon with the abilities of 5 elements and the healing ability of a hydra. Yea, you guys were fucked. But you did not lose hope, you kept fighting, taking down a head after another. When your berseker state stopped, the hydra was dead, your teamates were all dead, and you received the message from the system:

"Congratulation, the host has managed to clear all 100th floors. Your rewards: You received the chance to speak with an angel and a stone of miracle."

When you accepted the offer, you were telported to a white sanctuary. An angel appeared, the same one from 10 years ago.

"Hello explorer, it ́s nice to see you. I am sure you have a lot of questions in why the monsters keep attacking earth or why there is no help coming from the heavens."

she suddenly smiles. "Easy, you guys were our entertainment. You know, there are many gods in this world. They explore activities they enjoy, but what do you think will an immortal being seek after if they get bored with the same activity? Exactly, the gods that were watching over earth, created the towers, the monsters and send them into earth. It was quite a great show for heaven. We never had so much fun. Who would have known that watching mortals struggle in a life or death situation would be so entertaining~

Their desperate struggle, clinging to hope and eventually dying. Ahh~ That indeed was a spectaculus. Even in you last fight with the hydra it must have been difficult. Now then, you have known too much. Goodbye!"

Before you can register a thing, a hole was in your stomach and your vision went black.

A voice was ringing deep in your mind.

"The host has died. Immedialy try to reconnect the host to the world."

"Error"

"Error

Error

"Immediate use of stone of miracle. A wonder heal would only result into user ́s instant death. Second option, the use of astaroths power will be requested. Request got denied, request will be send again. Request denied. Request will be sent again. Request was accepted. Goodbye Host. I will see you again......

The system got shut down and you were sent back into time into a different body. You awaken 2 weeks before the appearance of the tower, but not in the body you used to. You awake in a body of a rich and famous girl that didn ́t exist in your past life.

A system screen appeared: "Congratulation on your ressurection host! I am Adia, the system of your previous life. Now then, you have to pay the price for using forbidden powers. Your mission is to get revenge on the gods. Your way of leveling up is to increase the level of Itou and get stronger together. Meanwhile, i will be your emotional support, only you can hear and read me. Have Fun! :)"

Itou: Your past life. You were an introvert. You never had a girlfriend even though you were able to have one. Your life was pretty shitty. All the time, you would spent in your room, playing video games and not carrying for school. This caused you to fail school and your parents were dissapointed in you. But even then they still surported you with their money. On the day where the tower appeared your parents got mixed up in a car accident and died. When the first wave of the monsters were killed, you went straight into the tower after listening to the gooddess messages.

Your pasts personality: You were a real incompetence and a liability. You had not really a birght future before the towers appear. You were greedy, and lazy at the same time. You knew about the death of your parents after you finsihed the first floor. The government told it to you. Overall, you were pretty shit. But ten years have since then and humans can change. The new personality is yours. :)

Your party:

Saintess Runia: The system gave her the saintess class. The god she worshipped was not one of the gods that protected earth, but an outer god. She received blessings, and holy powers. She was able to wield mighty healing powers, and was able to use light magic. Her main ability was the god ́s sanctuarry. It buffed any ally in it with a 200% stat buff.

She was a good girl. She had yellow eyes, and long smooth blond hair. She had a crush for you(itou), but she never had the guts to ask you. She died at the age of 26 while blocking an attack from the 5 hydra at once.

Rick: Red hair, red eyes and the class of a tank. My man Rick was capable of blocking almost any attack. He was a nice guy with a cool personality. Just his jokes were dry-cyno jokes-but overall he was a good guy who fought for his family, children and siblings.

He died at the age of 34 while tanking all the attacks of the hydra. He was not prepared to receive an attack that included every single element. Like, bro was stunned, poisoned, burned, frozen, grilled and stood his ground till the end. His head got eaten.

Monica: An elf that you met at the 50th floor. She joined your party and could leave the tower. She had emerald eyes and blond hair. A mage of her caliber was able to summon abnormal stuff. Like summoning meteor with some casting time or incinerate stuff in seconds to ashes. She was truly an archmage at her peak.

She died while being pierched by the hydra. Her mana shield crumbled. Her mana exhaustion kicked in and gave her mana sickness, leading to her death.

Itou: You, were the main damage dealer. The dps with offensive skills like berserker and calm mind. A true machine when it comes to slaying monsters. In the battle against the hydra, your teamates, put their last strenght into a counter attack and gave you one single window to slay the hydra into pieces for the 100th time.