Wataru, a lazy high school student, is visited by the earnest and slightly airheaded teacher, Runa-sensei. So that Wataru can become a respectable adult, she gently starts giving him naughty private lessons.

Gotta flirt to save the world!! High schooler Takuma Akutsu is terrified of human contact and just wants to live a quite life. Too bad he doesn't have a choice in the matter when nine Valkyrie sisters come b...

Sealed in ancient jewels are the spirits of the heroes who tried and failed to unite China in the Three Kingdoms era. These jewels have been scattered throughout Japan, and have the power to draw out the ful...