Lucas has attachment issues due to a traumatic event, which led him to shut himself out from the world. Even though he is a lone wolf, there are two people who still try to talk to him. One is his teacher, Keith, who is concerned about him, and the other is his classmate, Ken, who wants to befriend him.
One day, Lucas' mom announces her engagement to her fiancé, which angers the protagonist. He soon realizes that he would become step-siblings with Ken and Keith, the two people who constantly bothered him.
But maybe his new family members will help him to open up and feel accepted. Maybe the change isn't so bad.
'Those Darn Brothers!' is a slice of life BL about bonding with family.