Kaori Fujimiya is always alone because all of her happy memories, including time spent with her friends, disappear every Monday. Deciding that he wants to be friends with her anyway, Yuuki Hase tries to get close to Kaori each week, wishing that she would one day call him "a friend."

Isshuukan Friends. was published in English as One Week Friends by Yen Press from December 19, 2017 to June 18, 2019. It has been licensed in Spanish by both Panini Manga México and Ivrea Spain.