I was totally pulled in to this depiction of mature age BL story of love and breakup.
The acting was wonderful and all the small nuanced gestures kept the feeling real. This couple have reached a rocky point in their relationship and the more conservative Fumiya calls it quits. This breakup on, Ritsu's birthday, is incredibly real and raw.

Then we are taken on their journey as Fumiya learns that Ritsu rushing out that night has been involved in an accident. Fumiya realises Ritsu has lost all memories of him and any associated with their life together. He resolves to assist Ritsu and makes the fateful decision to label himself as his roommate.

This decision seems counter-intuitive here. Fumiya has the perfect opportunity to 'reset' their relationship and regain the love. I can only surmise, as he avoids all of the 'signals' from Ritsu to form a love relationship, that he is worried that Ritsu, upon regaining his memories, will recall the ugly break-up.

Their relationship is shown in a series of flashbacks as places they have previously been to are revisited. The love and care is beautifully shown and I was very invested in their getting back together.

The writers do a wonderful job of slowly revealing the arc of their story and there is a very satisfactory and believable ending.