One Week Friends

High school student Youshu notices that his beautiful classmate Xiangzhi is always alone and seemingly has no friends. After approaching her and becoming better acquainted, Xiangzhi reveals that every Monday she loses all memory of her friends. Despite learning this, Youshu endeavors to befriend her anew every week.
Based on the manga series of the same name, written and illustrated by Matcha Hazuki. (Little Monster Entertainment)