Fall_outplayer
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also since the setting is highschool, I have suggest about teacher character that'll be harem member; Tachibana Hina (Rui's older sister), Chabashira Sae [COTE], Kirusu Mafuyu [Bokuben], Hasegawa Chisato [Shinmai Maou no Keiyakusha].
Ogiwara Sayu [Higehiro]. Based series, her plot is quite simple.
Good chapter
