Futakaku Kankei.

Twin sisters Airi and Himari have shared the same appearance and close bond since childhood, dressing and styling themselves identically. Upon starting high school, their relationship begins to change as Himari gradually distances herself. When confronted by Airi, Himari reveals she has "a promise with senpai to fulfill," and insists on keeping it regardless of the consequences.

Isinasalin pa — orihinal na teksto sa English.