Kazoku ni Narou  

Kazoku ni Naruu, 家族になろう

Rikuumi has always lived with his father alone, but that is about to change as his father recently remarried and brought home a new mother and an older brother. Although Rikuumi was excited about the prospect of having a new family, he soon realized that things were not going as smoothly as he had hoped. Despite Kuuya's charming appearance, it became clear that he was actually quite mischievous and difficult to deal with. As a result, Rikuumi's hopes for a happy family life may have been shattered due to Kuuyas behavior and attitude.