Light novel series written by Nishino Katsumi and illustrated by [[Koin (foxmark)]].

It was adapted for manga, TV anime and OVA. The manga version is illustrated by [[Yamaki Rin]].

h4.Characters

* [[Oyamada Kouta]] (protagonist)
* [[Minamoto Chizuru]]
* [[Ezomori Nozomu]]
* [[Asahina Akane]]
* [[Minamoto Tayura]]
* [[Sasamori Yuuki]]
* [[Nanao Ren]]
* [[Nanao Ai]]
* [[Kiriyama Omi]]
* [[Osakabe Mio]]
* [[Kumada Ryuusei]]
* [[Sahara Iku]]
* [[Yatsuka Takao]]
* [[Yukihana]]
* [[Tamamo (kanokon)|]]
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