学校一の美人先輩の俺への好感度が、俺の知らない間に勝手に爆上がりしていた件。そして先輩が勝手に病んでいってる (Associated Names)

Tokiwa Sendai is an ordinary high school student who started commuting by train this spring. However, on the day of the entrance ceremony, he accidentally bumped into a pe*vert on the train and knocked him down. Sendai left the scene, partly because it was just a coincidence, but rumors spread on their own, and it…