Hanazono-san Chi no Futago-chan

Tatara Tani is an unremarkable student whose only notable connections are with Yuriko Hanazono, a famous idol, and her twin sister Ranko, a stylish classmate. The sisters, who are also his classmates, have been childhood friends, drawing envy from others. When Yuriko invites him to an amusement park, pretending to be Ranko to avoid violating idol dating rules, the deception is uncovered. To help Yuriko, Ranko steps in by posing as the couple. The situation spirals into a series of romantic misunderstandings and comedic mishaps.