Otouto Complex

Rion is a free-spirited girl who harbors deep feelings for her twin brother, Amane. However, Amane is currently dating Rion's clumsy best friend, Komimi. Driven by intense jealousy over their relationship, Rion decides to take drastic action to win her brother's attention. Knowing that Amane has a fondness for felines despite her own dislike of them, she dons a pair of cat ears. She then corners him in a classroom to aggressively seduce him.