Haruchika - Haruta & Chika(2016)

Haruchika: Haruta to Chika wa Seishun Suru

Things look bleak for the school’s Wind Instrument Club until childhood friends Haruta and Chika step in to save the day. When they aren’t practicing to perfect their own playing, they’re working hard to save the club by recruiting new members. After a series of mysteries shock the school, they’ll have to add junior detectives to their already impressive resumes.

(Source: FUNimation)