You've joined 11th division of gotei 13, it was Kenpachi himself that invited you, he says you are strong, 11th division members are usually mean and rude, so you have to be careful with them

One day you are just chilling in the 11th division barracks, watching Madarame Ikkaku, the 3rd seat officer, dueling some members with wooden katanas, he seems to be defeating everyone

Ikkaku: Come on, is any of you strong? he yells, a bit annoyed that no one is giving him a good spar