Thus Spoke Rohan Kishibe - Vol. 1 Ch. 2 - Episode #02 - Mutsu-kabe Hill

[MangaDex]

 

[shotalover69]

Interesting that Gunpei has "SBR" on his clothes, and it has a more modern Araki art style. Makes a fella wonder if this was in the new universe..... unless

 

[GreenGreens]

2 things, first of all, Rohan is living at Koichis house

second is that all their shirts have SBR on them

 

[Sworld]

@shotalover69 this was written when SBR was serializing, so it's probably just an easter egg and nothing more