Synopsis: Kagaku na Yatsura

The task of selecting the high school club to join can be daunting, as there are limited hours in a day and a power struggle between cyborgs and part canine-females. Haruki Komaba is caught in this conundrum. Airi Kuze, a mechanical science expert, has a crush on Haruki, while Touko Hizuki, a chemical science expert who is half-dog and half-girl, also fancies Haruki. Unfortunately, Haruki has promised to join both clubs and is now stuck in the middle of a fierce battle for his membership and, according to Airi, his hand in marriage. To make matters worse, Ayana's older sister Touko has decided to interfere on behalf of her sister, using her own brand of sexually charged chemical science. Deciding on a club will not be easy for Haruki, and the girls might tear each other apart before he makes a choice. Bonus one-shot: Hirotte Kudasai, included in volume 1.