Because We Forget Everything

M searches for his missing girlfriend, and crosses paths with strange members of the public.

M learns that his girlfriend has been missing since Halloween and that he knows none of her friends.

M's editor tells him to create a social media account. Despite M's concerns, he starts to gain followers. However, once he makes an announcement about a face-to-face event, he receives a threatening message.

In Tokyo, Christmas and New Year's blend into one. Family travels are in season, but mystery writer M has no one to see and nowhere to go. At BAR Lighthouse, M nearly blurts out the truth.

When it reaches past midnight at BAR Lighthouse, M has to deal with a beautiful female fan of his, and the drunken Izumi. M leaves the bar with the woman, but discovers something strange.

M hears that a TV producer he used to work with has fallen ill. He visits his former company to find out more. On his way back, M finds F's sister at BAR Lighthouse, deepening the mystery.