Haruki Komaba faces a difficult decision when it comes to joining a high school club. With limited hours in the day, and a power struggle brewing between cyborgs and canine-hybrids, the choice is far from easy. Adding to the complexity is the fact that both Airi Kuze, a mechanical science aficionado, and Ayana Hizuki, a chemical science expert who also happens to be half-dog, have set their sights on Haruki. Despite Haruki accidentally vow to join both clubs, the competition for his membership is fierce, not excluding Airi's intentions for a possible marriage proposal. Moreover, Ayana's older sister Touko, with her own brand of sexually charged chemical science, complicates the situation further. With potential for chaos ahead, choosing a club may not be Haruki's only concern.