
Side couple, one is fully grown office employee who ends with a college student, you can trust me on this because I would never support morally illegal age gap even if it’s legal on papers ( I hope I’m right because it’s been ages since i read this) main couple though are similar in age maybe a year or two difference

Yeah, but this is a green flag one. Matsu is really keeping himself in check and let's Yuki figure things out on his own in his own time and tempo. Only supporting and not pressuring. And to be fair, in reality there are more than enough consenting couple with quite an age gap. It's rarely the age gap that's concerning, but more the behavior. And here? Couldn't be better

Main couple M and H have around 3-4 year age gap, M being early 30s and H being mid 30s. Sid couple with the twins and A is about 5-10 years apart, A being late 20s/early 30s and twins being mid 20s. And the last side coulpe with Y and T is at least 15 years, Y being early 20s and T being mid 30s.
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I’m not the one for such huge age gap mangas but this one is too cute to not be an exception