It starts off with Osamu and Atsumu as four year olds, trying to learn what "forever" means after hearing it on TV. Osamu is the one who understood it best though, Atsumu just went with it, he made one promise though. "Samu, I promise I'll love ya no matter what yer do, forever." And for years that promise was kept, but now who knows.
Author's note
I know this is short but it's literally just a little background info before I started the actual story

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what is forever? ( angst)
Random"Samu, what does forever mean?" "Huh? it's just something that lasts I guess, why?" "then you'll be my brother forever?" "Yeah, that's how it works Tsumu, why?" "are relationships something that are forever?" Kiyoomi has been cheating on Atsumu wi...