Ms. Rinna's Lovesickness! EX

A series of romantic comedy doujinshi that focuses on Rinna, the 17-year-old ace police captain, and Meishi, a goofy but gentlemanly detective. These can be viewed on their own, but it's enjoyed more when combined with the published work of the same name.

You can buy the books on Melonbooks, Toranoana, Amazon Japan (eBook only), and Bookwalker (eBook only).