she is a homewrecker and slept with Hasumi while he had a girlfriend.

It's so bad shipping the ship that you know they will break up for sure, it's just a matter of time. Every chapters about Sumire thinking of Momo made me nervous that they will break up. They came a long way though, more than 2/3 of the story. The reason why Hasumi & Sumire relationship doesn't work from the beginning is that she doesn't open up for him even though he asked for it, so she keeps lying to him, to herself & doesn't feel comfortable around him. I thought Hasumi would be a jerk but he turns out loyal to the end, broke up with no drama, I teared up lol. It was both of their faults that they broke up & Sumire is a hypocrite if she blamed Hasumi for living with Fukushima because they really didn't do anything too intimate.
Another thing is that Sumire doesn't fight for their relationship like Hasumi, Momo, Momo's ex & Fukushima, she let Hasumi did everything and never really into it. I don't think Fukushima is a troublemaker since Hasumi still loves Sumire even though she's trying to seduced him so many times. He was shaking a bit but still loves Sumire anyways. I think she's just an excuse for Sumire to realized her feeling toward Momo & to give Hasumi a good ending. I have a lot of comments about Hasumi & Fukushima's ending but that would be too lengthy.
I wish Hasumi knows the truth about Momo because he deserves to know it.
I love Momo's short hair btw haha.

For example, a woman having a younger lover with quite some age gap. This one probably is more accepted now but having the woman look after and pay for him is generally frowned upon in society. But I like how the characters don't treat it like a big problem, because traditionally it is the man's job to pay and look after the woman but now there's gender equality so as long as both parties are happy why should it matter to them? Also the matter of 'pride' being the reason why woman can't be smart or superior in any way, that's absolutely stupid because if you love someone the most important thing would be being by their side, not your pride.

Another thing I liked was how innocent Sumire and Momo's relationship was, I think it's lovely to cohabitat with someone and support each other like family. But there's also the thing where they all love more than one person, if you can love more than one friend, more than one family, I don't see why you can't love more than one person. Granted it may be rare therefore not socially accepted but I believe that you can love more than one person at a point in time. I also like how Momo actually said that he likes Sumire's boyfriend as well, in fact the author basically describes Momo as bisexual and I think it's nice how the author is open minded and thought that far because that does fit Momo's personality.

Another thing is the height difference, Sumire is much taller but they're still a great couple, it just emphasizes how its not the physical appearance that one falls for. Momo being shorter also doesn't make him any less manly.

One thing I didn't like as much is that Sumire does give up her job, but the author takes it seriously and I'm trying to justify it to myself that its about making compromises for love and that she has chosen to continue because sshe's writing freelance and there's a chapter where she talks about how she only wants to write what she's interested in.