Kawazuya - Vol. 1 Ch. 15 - Toad Oil

[MangaDex]

 

[mamangskuter]

i thounght it reference to summon jutsu 3 sannin in naruto, but it reference to RPS

 

[jackjack9]

i thounght it reference to summon jutsu 3 sannin in naruto, but it reference to RPS

I thought of those three as well

 

[Spoopa]

i thounght it reference to summon jutsu 3 sannin in naruto, but it reference to RPS

My guess is that this is what inspired the 3 Sannin Summons