Haruchika (ハルチカ), also called Haruta & Chika, is a Japanese mystery novel series by Sei Hatsuno.

A manga adaptation published by Kadokawa Shoten in Monthly Shōnen Ace began serialization in December 2015.

The two are childhood friends that got split up but reunited nine years later, and they spend their days studying and also trying to recruit new members.

A manga adaptation[3] illustrated by Būta, with character designs by Namaniku ATK, began serialization in Kadokawa Shoten's Monthly Shōnen Ace with the December 2015 issue, published on October 26.

[12][13] A live-action film adaptation of the same name starring Shori Sato of the idol group Sexy Zone and Kanna Hashimoto premiered on March 4, 2017.