Eita Touga, heir apparent to a distinguished line of ninja. Trained daily in vigorous and dangerous ninja arts, and capable of dispatching any assortment of foes - but unfortunately for the Touga Ninja Dojo, Eita has no interest in taking over the family business. More interested in raising flags in a dating-sim than occupying himself with humans of the female variety, Eita has sequestered himself to a life of digital bliss. That is until one faithful day, life comes-a-knockin' - or rather, kicking! When a mysterious harpy-girl kicks in the door to his family dojo, Eita is about to be spirited away into a world of mythological lore, as he must help assist the denizens of an other-worldly dimension stave off against the invasion of a technologically-advanced empire.