Dio has a long-time crush on his superior, Aidan. He thinks of leaving the army when he becomes a sergeant, as he had decided to ever since he joined the special forces, but in the hopes of having even just memories, he musters up his courage then confesses and has a one-night stand with Aidan.
However, Aidan feels drawn to Dio over this night then asks him out on a date and the two begin dating.
As they talk a lot and their relationship deepens, things they can not say to each other pile up so...?