10 years after the worst birthday - Jun and Karin regained their peaceful daily lives. Karin was about to turn 28. In order to make it the best birthday, the two of them decide to go on a hot spring trip. But soon, a seemingly perfect trip turns into a nightmare, and everything is made more difficult by the fact that it was supposed to end with a proposal. (Source: Japanese = video.dmkt-sp.jp || Translation = MyDramaList)