Shiki Tsukai

Shiki Tsukai (四季使い, lit. "Four-Seasons User") is an manga written by To-Ru Zekuu and illustrated by Yuna Takanagi. It is serialized in Kodansha's shōnen manga magazine Monthly Shōnen Sirius, and has been licensed in North America by Del Rey Manga.

Plot
Just before his fourteenth birthday, Akira Kizuki discovers that he is a shiki tsukai, a magical warrior with the ability to control the seasons. He is a special one called the "Shinra" He soon finds himself being protected by an attractive humanoid kijyuu named Koyomi. As shiki tsukai, they are keepers of the seasons and defend them against the evil forces that threaten to destroy the delicate balance of the natural order. Now spring and winter Shiki Tsukai fight against summer and fall to protect the human race.