Read this first before watching the video. This anime is called Golden Time. The main character Banri (The guy) Was hit by a car two years ago. This accident gave him amnesia. Now he’s losing his current memories, meaning this version of himself will “die”, since he’ll lose his sense of identity when this happens. Now when you watch the video above it will make some sort of sense.
This anime is really good. You can thank me later after you watch it.