15 years have gone by since Mikuriya and Kusaka eloped at 17 after their parents refused to accept their relationship. Suddenly, Kusaka says he wants to break up with Mikuriya. The only reason Kusaka will give is that Mikuriya broke his promise, but if Mikuriya is able to remember the promise and beg for forgiveness, he'll rescind the breakup.
Nichijou Climax