Akaneiro ni Somaru Saka

Attending a top high school is Jun'ichi Nagase. Since he was a troublemaker in middle school, he has gone by the moniker Geno Killer. This is unintentionally used to save Yuuhi Katagiri from problems. Later, she switches to his school. Jun'ichi then kisses her as a result of a miscommunication. She screams at him indignantly because he stole her first kiss and humiliated her. Yuuhi ends up being his fiancée as a result of their parents' arrangement, it turns out. After talking about the situation, their parents decide that they should spend one month dating each other. Their engagement will be called off if their relationship does not improve.