After becoming working adults, four former classmates reunite for a long-overdue drinking party. When some of them still feel like drinking more, they head to Rei Kitajima's place to continue the night. As they reminisce about old times, the conversation turns especially lively when they start talking about Rei's mother. The discussion evolves into a vivid, fantasy-filled recollection, creating a warm and almost variety-show-like atmosphere as the three friends imagine what Rei's mother was like back in the day.