Koeda has experienced various "firsts" with Masamune, and now their first year in high school is finally over! Koeda wants to spend spring break together, but Masamune has been acting a little strange. Meanwhile, Koeda wins a two-day, one-night stay at a hot spring and invites Masamune to come with her, but panics when her friend tells her that she should be ready for "intimate relations." Is that really how their first trip together will end?!