Okuremashite Seishun

Wakaba (20), a university debut girl longing for youth. She decides to hit the town in her school uniform cosplay for Halloween and unexpectedly ends up on a date with Tachibana-kun, a high school boy! However, it turns out that Tachibana-kun is actually a university student who friend left him out of the date. In order to make Wakaba's dream come true, he reluctantly agrees to continue accompanying her on uniform dates!?

(Source: Comic Days, translated)