Is Shigaraki Deku's Brother の小説・ストーリー

So Hikari didn't have any choice but to take the challenge of finding it out. After a long walk, they then meet with Suzuki. Akaru goes to Suzuki and says to him "It was all up to you now. I have bought them here." Suzuki was so weird when he heard that. But he never heard from anyone that Akaru will come with them and they never met before. Suzuki tries to ask Akaru about that, but Akaru just ignores him. Akaru says to Hikari, Neu, and Nimura that he will take a leave and he wants them to just be happy because he will always watch their back. They all accepted it and Akaru just goes away. When Akaru wasn't there, Suzuki asks them "Who is him?" They just tell Suzuki that it was an old friend

I can't believe Hiroki had a brother, I always thought he was a loner, at least an only child, but I never thought he had any relatives close to him (and less with his rude attitude). From his appearance he doesn't give me the impression that he's a prince and he looks younger, I guess he's Hiroki's younger brother, however, they don't look much alike, Hiroki has abundant and long reddish hair, almost the same color of fire or a sunset, deep black eyes and a defined face, but his "brother" has brown hair, greenish eyes and his face is younger. Instead, his appearance is somewhat attractive and cute, he looks more friendly than Hiroki really, since Hiroki just gets a bad face all the time and