Aikawa Aoi has unforgettable bitter memories of her five-year relationship with Kobayashi Kei. Aoi's senior at work, Nao, is worried about Aoi since she hasn't been able to get over her breakup, and gives her a certain pill. The name of the pill is "Bourenzai" / "To Forget the Memories of Your Love". It is said that if two ex-lovers take this pill together, they can erase all the memories they shared from the time they met to the time of their breakup. Aoi was skeptical, but on the night she went to Kei's house to pick up her belongings, she decided to try the pill. (Source: NHK)