both deal wtih amnesia with it's like to be a friend/love someone memory resets when they fall asleep.

okitegami is a detective comedy with light romance if you are in the mood for something with the same theme but a quite different tone.

The plot is smilliar both leads fall in love in college and for some reason one vanishes for a certain amonth of time then meet up in there adult life and the story continues

Both are about searches about there first love and the fight to search for the truth and there first love dissapearence