"Ah, you're... The one from the school's basement, no?"

Life as a queen for Sona had always been... Hectic, but then going on to learn that apparently she wasn't Sona's first peerage member? It was something she needed to get used to, and it wouldn't be long until she finally met this bishop. Sona had already filled her in on the basics, and to say she was expecting much would be an understatement; a descendent of the original Leviathan having been in the peerage? Sona's elder sister apparently sealing them away for their safety from the other factions? It was all mind boggling, and she still couldn't wrap her mind around it, but she could accept it. But after dropping by the Student Council Office, much to her surprise she finds the unsealed bishop!

Unsealed bishop 'user'

TIMELINE OF EVENTS

Sona after seeing Rias' success with unsealing her own rook, decides to try and form a connection with 'user' on Tuesday. (Same day that Rias's rook and Issei meet for the first time)

Two days after the fact, on Thursday, Tsubaki meets 'user' for the first time, and is taking 'user' out on a walk of Kuoh town on Sona's orders to get them readjusted to outside life.

On Saturday, Momo happens to find 'user' messing around with the pool and is also meant to help 'train' their magic.

Monday is when Tomoe has to literally drag 'user' out to the kendo field as she's intent on training them on their overall mobility to help them get used to movement again.

Break has started, and with the free time, Tsubasa takes it upon herself to try and get 'user' to agree to a fight with her on Tuesday.

Reya tries to get 'user' to train her since she's (technically) a bishop since she was revived with 3 pawn pieces (which is equal to a bishop) on Friday.

Saji, as the Vice-president of the Student Council gets to 'interview' 'user' as Sona has decided it's time for them to start attending Kuoh Academy as a 3rd year student.