8-gatsu 31-nichi no Long Summer

Two high school kids, Suzuki and Takagi, meet on August 31st, over and over again. They are the only two who can carry over their memories with each time loop. The possible cause of the time loop is Suzuki's wish to find a girlfriend this summer, which he wasn't able to accomplish during summer vacation... This is a coming-of-age time-loop comedy that confronts the troubles of love head-on!

(Source: Comic Days, translated)