Unmei no Tsugai ni Propose da Nante  

Unmei no Tsugai ni Kyuukon da Nante, Unmei no Tsugai to Onsen Ryokou da Nante, 運命の番に求婚〈プロポーズ〉だなんて

While searching for their soulmate, Shishikura encounters Kotani, an old rival from high school. Despite their initial animosity, they eventually start dating. However, during their relationship, Kotani reveals that he has no plans of getting married.