Isshuukan Friends is a manga written and illustrated by Matcha Hazuki. In April 2014, the manga was adapted studio Brain's Base in the anime series.
High school student Yuki Hase notices that his classmate Kaori Aya is one and has no friends. After exploring, Kaori says that it loses all memories of his friends every Monday. Learning of this, Yuki wants to become her friend every week.
