Genre: Comedy, Drama, Romance, Shounen Ai, Slice of Life
Haru visits Canada to spend his summer vacation in the woodland house of his strict, strong-willed mother Haruko who purposely fools her son into believing that she’s on “the verge of death” only to burden him with the responsibility of taking care of her newly adopted “puppy”. That “puppy”, in actuality, is a small, rash, anti-social little boy named Ren who doesn’t trust anyone and would prefer hanging out with Haruko’s dogs. Haruko orders Haru to “civilize” Ren until the end of summer. As the young man struggles in doing everything he can to help Ren, their relationship gradually improves; so far so that when Haru graduated high school, he planned on taking Ren to Japan for them to live together with his twin stepbrothers.
Unfortunately, an accident occurs that causes the death of Haru’s father and stepmother, leaving him the only survivor. The accident causes him to lose his memories of that summer.
5 years later, Ren comes to Tokyo, Japan and claims Haru as his new “brother”. Will Haru be adjusted to his new upcoming in life and make a new promise to Ren?
The eldest brother and the head household of the Kaidou family. He is the adopted brother to Ren and stepbrothers to Aki and Shima. 5 years ago, when he went to visit Canada, he met Ren. Even though Ren was quite hostile towards him, he managed to make Ren open his heart. He lost his memories of that summer when he came back to Japan due to an accident. When he meets Ren again he isn’t too keen about the whole “brother” thing, but he quickly warms up to him again. He tends to dote on Ren a lot much to the annoyance of the younger boy as well as Haru’s younger twin brothers, especially Aki. He is quarter-Canadian. He has a kind and child-like personality and cares dearly for all of his brothers, especially Ren.
The 4th and youngest brother of the Kaidou family. 5 years ago, he was a wild anti-social little brat that behaved like a dog which led to Haruko having a hard time raising him. When he first met Haru, his life gradually changed and started to accept the society life because of him. He attends a co-ed high school in Tokyo and is starting to make friends. In the series, Ren has a calm and steady personality, and he acts more mature for his age. According to Haruko, there is a possibility of his birth name being Allen and that his biological mother was a drug addict who sold him for drugs. This, however, has not been outright confirmed.