Adekan

Adekan is a japanese manga series created and illustrated by mangaka Tsukiji Nao. It has been serialized in the magazine Wings since 2007.

Plot
Shiro, a laid-back and absent-mindedly seductive umbrella craftsman, is (surprisingly) a close friend of Kojiro, a hot-blooded young police officer who stands against all things undisciplined.

With their mutual knack for attracting trouble, the pair soon find themselves involved in a bloody and erotic thrill-ride in their off-kilter town full of equally off-kilter people.