Hitoribocchi No Seishun

Hitoribocchi no Seishun is the character theme for Tatsuya Midorikawa, sung by his actor Naoya Uchida. He does not sing it in series, but it is played as background music for multiple episodes, including Ep. 19: My Prince of the Stars, Ep. 30: Missing, Stolen, Gone and the movie; Midorikawa himself doesn't sing it but plays it on piano in Ep. 22: Super Time, Strange Experience