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, allowing him to witness the event and reject your rival.
- Main Article: Osana Najimi
On Thursday, Yandere-chan must turn off Osana's phone alarm while she is taking a nap on the rooftop by playing a timed button press mini-game.
On Friday Yandere-chan must use a directional microphone, bought from Info-chan, to record the conversation between Musume and Osana. Once Osana has found classical music for Senpai, Yandere-chan must steal her phone and replace the music in the Computer Lab with the audio she recorded to make it sound like Osana is bad mouthing Senpai.
- 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.