Kawaru Sekai summary:

Momose, a first year in his school's Kendo Club, finds himself attracted to his senior, Minagawa. However, knowing Momose's feeligs, Ikeda flaunts the fact that he is going out with Minagawa. On the other hand, Fujiyoshi, Minagawa's classmate, happens upon Minagawa and Ikeda kissing, and finds himself harboring new feelings for his friend, Yamashita. In the Kendo Club, Professor Izumi can't stop thinking about one of his students... Starting with Momose and Minagawa, unexpected loves being to unfold!