Missile to Plankton

Tatsuko Sachi transformed herself into a self-proclaimed "genius" at a renowned school to be in close proximity to her crush, Oumi Shouta. When Shouta establishes a missile-building club, she readily assumes the role of vice president. Nonetheless, Sachi bears the bulk of the workload as Shouta neglects his duties. Matters deteriorate with the arrival of a childlike girl named Onda Midori, as Shouta lavishes all his attention on her. Even possessing superpowers fails to mitigate Sachi's predicament.