Yomizuka no Kaii-san

Yomizuka Junior High School is in a rural town. In it is a strange school club called the Mystery Verification Club. The club has two members: Toramaru, who has chuunibyou, and Miko, who is more normal. But their club activities, which began out of mere curiosity, eventually begin to involve all kinds of people...?!

(Source: Kadokawa, translated)