Senpai is not able to fall in love with rivals on his own accord. He will start to develop a crush on a rival if she has five interaction events with him. Once a day, there will be an "event" with Senpai, with the final event being a love confession. Yandere-chan will be able to sabotage each event. If she sabotages all five events, Senpai will reject the rival's love confession. Sabotaging four or less will make the outcome depend on the reputation of the rival.
Damaging a rival's reputation by gossiping about them is also another way to make Senpai reject her love confession, as Senpai can never love someone with a low reputation.
It may be possible in the future to provoke a rival enough for them to attack Yandere-chan in front of Senpai, so that he can see and reject the rival.
- In the full game, if Senpai has to reject many rivals because he can't get along with any girl he meets, then he will worry that he will never find a partner.