Amanchu!: The Story of the Promised Summer and New Memories
Amanchu! Yakusoku no Natsu to Atarashii Omoide no Koto · あまんちゅ！ 約束の夏と新しい思い出のコト
Synopsis
An unaired episode bundled with the seventh BD volume of the Amanchu! anime series.
Studios: J.C.STAFF, flying DOG
Source: MANGA