@kiyorisu Tsubasa, Like If you want proper slice of life then maybe Keep Them in another school with some other anime characters like Hachiman etc.. or if you want she falls in love with kiyo like after y2 v4 their fight ( in this universe kei isn't his girlfriend) so basically she was then close to Kiyo after y2 v4, Kiyotaka somehow help her recive from Matsuo or smthing like that then she have little feelings for him....As for kiyo you can relate that she always suprise him which leads him to develop feeling for her, anyways it was just an example, you can write in Your way but I think if you can then Tsubasa will be excellent choice