Ano Koro, Watashitachi wa Mahoutsukai deshita.

あの頃、私たちは魔法使いでした。

Usa, a sixth-grader, befriends a magical girl!? A heartbreaking and precious story about how he cherishes and enjoys each day until they part ways after only being together for a year. (Source: Akita Shoten, translated) Note: Includes the pilot one-shot.