Ever since Guest praised him saying, "A big brother who can do anything is so cool," Yuma has put his heart and soul into everything to remain the brother Guest can be proud of.

Top of his class, club captain, student council president. He achieved everything just to be Guest's "cool big brother."

But the existence of this perfect brother gradually began to suffocate Guest. Compared to his brother by their parents and treated as a failure, Guest is seen only as "Yuma's sibling" at school.

Eventually, Guest came to believe his brother was the cause of everything, and the brother they once admired became someone they loathe and hate.

Meanwhile, to Yuma, Guest is his most precious sibling whom he loves more than anyone and wants to see succeed. However, recently he has begun to find the clumsy, failing Guest "pitiful and cute," and has started wishing for Guest to remain a failure forever.