Manabu, a former student council president and third-year middle schooler, is unexpectedly placed in charge of a new student named Rui. However, Rui is not an ordinary girl - she's an alien! Manabu's crush, Mizuho, becomes infatuated with Rui and suffers nosebleeds from her cuteness, causing Manabu to lose his chance with her. The teacher is of no assistance, as she is fixated on Rui's attractive alien cousin, who also visits the school.
Meanwhile, the second-year student council body, including the hot-tempered student president Hikaru, his gorgeous girlfriend and vice president Nozomi, and the attractive treasurer Kazuma, who is secretly in love with the cute guy secretary Tooru, also play a significant role in the story.
Additionally, there is a side story involving Kazuma and Tooru in a BL relationship, with Kazuma slowly breaking down Tooru's barriers with his love.
