“During summer break, why don't we go somewhere and stay the night?” The second half of Yamaguchi-kun's birthday date! Blindsided by Yamaguchi-kun's unexpected suggestion, Satsuki can't focus on the date at all! And because of that one remark, the two of them end up alone at Yamaguchi-kun's house!! They're supposed to put anything beyond a kiss into the list, as promised, but…?!