Ichou no Mau Koro 2

Main character is easily motivated and he takes part in multiple school clubs activities, but his grades aren't really good.
The story starts at the point when swimming club competition ends with a strange result and hero is depressed. His friends cheer him up and motivate to prepare passionately for the arts contest in autumn. He admires arts club head Mizuno Yuki and decides to confess his feelings to her after the competition ends.

[From vndbreview]