Ryu Asahina, the eighth son of the Asahina family, is also the adopted son of the Asahina family. As an adopted son, he does not have a good relationship with his brothers in the family. However, the day before high school started, he inexplicably picked up a "Brothers War Character Guide System". This system deceived Lucheng bit by bit, saying that it could improve his relationship with his brothers. He agreed to everything the system said, because getting closer to his brothers was what he had been looking forward to. But gradually, he discovered that his feelings for them and their feelings for him seemed to have deteriorated, and he no longer loved them so simply...