So these are the characters that are going to be in the book just gonna give you guys a short run down of the characters.
1 Ichigo Best friends with blade and also has a crush on Mikasa and he always needs to have blade around him so he doesnt get flustered when he's around Mikasa and doesn't know Yoko.
2 Yoko best friends with Mikasa and friends with blade and she has an crush on blade so then sometimes she makes things weird around when she's talking with blade that's why she have to have Mikasa also meets Kuroo and maybe start having a crush on him
3 Mikasa best friends with Yoko and always go to nobara house and has a crush on ichigo
4 Blade is best friends with ichigo and friends with Yoko but doesn't have a crush on her just yet but she really finds her interesting.
Kuroois going to be the one who takes Yoko away from blade and then he starts actually developing feelings for her.
That probably wasn't a short run down but at least you got where the characters are going though thanks! get ready to read the chapters!