Responses
No, the MC sent the picture of the cookies to his two friends (who helped him move in), not Jigu. But yea the suspicions probably started with the madeleines, along with the similar Neuta chibi game avatar with irl Jigu, the coincidental text at the kitchen, Neuta's habit of talking to himself, etc.
wait im not understanding, does jigu already know that the guy in the game is his neighbour?