M, a mystery writer, has a girlfriend of five years named F, who disappeared on Halloween night. When a woman comes and claims to be her sister, M begins the search for his girlfriend. Along the way, the people he meets describe a woman very unlike the F he knew.
Because We Forget Everything (Season 1)

I Hate to Say This, But Did You Kill Her? (Episode 1)
Air date: 2022-09-14
Runtime: 24 min
Overview: As M searches for his missing girlfriend and meets peculiar people, his quiet life begins to change.

Don't You Have Any Friends? (Episode 2)
Air date: 2022-09-21
Runtime: 24 min
Overview: M visits his girlfriend's workplace, a kindergarten, to find clues to her whereabouts.

I Will Break All Your Joints (Episode 3)
Air date: 2022-09-28
Runtime: 24 min
Overview: M creates his first social media account, and receives his first online threat.

I Want to Take You Somewhere (Episode 4)
Air date: 2022-10-05
Runtime: 24 min
Overview: It is past midnight at BAR Lighthouse and only M, a beautiful woman, and Izumi are left.

The Best Day of the Year (Episode 5)
Air date: 2022-10-12
Runtime: 24 min
Overview: M spends New Year's at home when he gets a call from his missing girlfriend.

Everything Changes (Episode 6)
Air date: 2022-10-19
Runtime: 24 min
Overview: M's life continues to slowly and surely change.

Are You Happy Now? (Episode 7)
Air date: 2022-10-26
Runtime: 24 min
Overview: After suddenly going missing one day, F's story is now finally revealed.

That Lie Counts for Something (Episode 8)
Air date: 2022-11-02
Runtime: 24 min
Overview: M is tasked with looking after a cat and Fukuo reveals a huge secret.

I Feel Like I've Come Very Far (Episode 9)
Air date: 2022-11-09
Runtime: 24 min
Overview: M and F reunite and decide to take a trip. M enjoys himself, but F realizes that she has changed.

Let's Stay Friends Forever (Episode 10)
Air date: 2022-11-16
Runtime: 24 min
Overview: One year has passed. People are moving on, and M finds the right way to finish his essays.
