運命で結ばれた恋人……のあざとい妹と一線を越えてしまう、あの日まで (Associated Names)

The person who sneaked into my bed that night was my girlfriend’s little sister. “If we meet again, then let’s be… lovers.” It was the promise I made to my childhood friend, Mahiru Mitsuha, on a distant day. In the spring of my second year of high school, we had a fateful reunion. We conveyed…