Cute, but deadly.
But Sou needs to hold her reigns tighter. I mean, on page 1 he does a good job, asking how their day was - showing he cares. Problem here is Miku's answer and Sou's reaction to her jealousy, saying she could punch Suzuki's lights out. I bet she could, but Miku needs to be stopped from brute forcing everything. The only one who can make her listen is Sou and since Miku is a meathead, he needs to literally hit her with a stop sign. Like gently flicking her forehead or something and telling her to chill down, relax and don't threaten people he wants to be friends with. But he's a total failure on that front, even partially going along with it, propably thinking it's just all jokes.
It's good for future hijinks, but in reality it would be a bad idea to let it continue just like this.