Chu x Pet

A high school student's life turns upside down when his mother announces her engagement and asks for his blessing. Raised solely by her, he agrees for her happiness. But on meeting his new family, he's shocked to discover his new sister is Sakuya, the school's popular student council president. Sakuya has an obsessive desire to make him her 'brother pet.' Adding to the chaos, his cousin Shuri feels threatened by Sakuya taking the sister role, and his childhood friend Kotori inexplicably hates him. Soon, he's forced to run for student council president. Sakuya, Shuri, Kotori, and Sakuya's twin sisters Yuzu and Kana will aid his campaign. Who will he choose to help him win the election?