Seira the most beautiful and bestest girl, I agree with Masato, would wife in a heartbeat.
Struck me thinking, she really owes her life to Miki-senpai, had she not taken her there and chosen Masato as her host, I dread to think how things might have gone down for Seira from there, depression like that is no joke. Senpai is also a good person and friend.
Our guy needs to be more aware and careful with what he says though, he basically said he likes her, is she supposed to take it as mere lip service even though his thing here is approaching her sincerely and forming a genuine bond? You can even pinpoint the exact moment where she broke, he ought to take responsibility. The part at the end where she starts crying really hits hard, she's a good person and knows this isn't right. Hopefully, everything will be made alright by the end.
The part I really hate however is how they all but explicitly drive home how not-NTR man got to take her firsts and toy with her for the 2 months until he got tired of her. At the beginning it was ambiguous and you could interpret it as her misunderstanding being a couple and nothing actually happened but then it's made clear the guy was scum and we see how he approached her first in a predatory manner when she was innocent.
Thanks for the translations, this series is a rare jewel I really look forward to every chapter.