same group; same gang; same circle
Refers to people who belong to the same social group, team, or clique. Often used in casual conversation to emphasize shared affiliation or insider status.
He's one of the same group, so you can trust him.
Those two are in the same circle and are always together.
Compound of 同じ (same) and 仲間 (group, companion). The phrase is transparent and follows standard Japanese syntax.