Detective Boys

Ayumi Yoshida, Genta Kojima and Mitsuhiko Tsuburaya. Conan's classmates in Teitan Elementary School and form a detective group of four... five, with Ai Haibara.
There's a... ummm... pentagonal love(?) between them. Genta and Mitsuhiko likes Ayumi, Ayumi likes Conan, and Conan loves Ran. I think Ai likes Conan, too, but I'm not pretty sure about it.