Atsugari Seito Kaichou to Hieshou Gal ga Boku ni Semaru

Shion Fukui, an ordinary high school boy, finds himself caught between two beautiful girls, the student council president Someko Momoneda (who dislikes the heat), and the gal Usami Kakimoto (who hates the cold). For some reason, he gets recruited into their school club, as he tries to help both girls improve their constitution...! (Source: Comic Cune, translated) Note: Includes 2 extra chapters.