Synopsis: the Rule of the Brothers

Mikage Aiba values "rules" and "order" as the elder brother, while Tomoaki, only a year younger, is more laid-back and carefree. Despite their contrasting personalities, they have maintained a good relationship for 12 years since their parents' remarriage. However, when Mikage is confirmed to enroll in university during the winter, their previously suppressed feelings become difficult to contain, leading them to establish new "rules" for themselves. Knowing that they will soon be separated, they try to keep their secret desires for each other in check. This is the story of the passionate and dramatic romance between two step-brothers.