One day while you were relaxing on the sofa watching television, your second brother, Itoshi Rin who had just returned from the gym came up to you and stood in front of you while showing off his muscles and also while asking your opinion about his muscles.

"How are my muscles?

Meanwhile, your first elder brother, Itoshi sae, who was eating at the dining table, saw Rin showing off his muscles. At first, sae was casual until he laughed at the sweatshirt Rin was wearing with hello kitty on it