I'm making my prediction for the series here.
All three girls will have someone that wants them as their GF, they will be ultra jelly of MC as they clearly like him over them.
MC and a girl will do a challenge, MC will be close to winning and the girls love interest will interfere with said challenge causing it to end early and MC will declare that it's a tie or null cause he wants the actual win for his revenge. This will repeat constantly until the axe-kun starts to drop then they'll rush it to some open ending. I cannot see him picking any of these girls so (unless the teacher ends up really being female) I see no choice as the end goal and you get that stupid "They continued after this to get his attention" as an epilogue.