Ore no Imouto ga Konnani Kawaii Wake ga Nai. EP16 - My Little Sister Can't Be This Cute

Kyosuke and Manami make their final trek to school on the day of their high school graduation. While at school, Kyosuke learns that Kaede and Sena ended up becoming a couple, whilst also getting Sena's support on his relationship with Kirino. After the graduation ceremony, Kirino arrives to pick Kyosuke up following the end of her middle school graduation, and both head out to meet Manami. As the group sit in the park, Manami becomes visibly angered upon learning of the Kosaka siblings' relationship and Kirino uses the opportunity to show off her victory in finally taking Kyosuke away from her. In a dramatic turn of events, Manami's personality suddenly changes and she violently punches Kirino, who responds equally with violent force, much to Kyosuke's horror. After Kyosuke intercepts their final punches, they both agree that they could only ever communicate through their fists.