It’s just one panel that doesn’t confirm anything per se. Hizumi has also been sexually propositioned to Shinba sometimes as a form of manipulation, knowing he will reject her.
It's because she once spoiled his ex boyfriend to the point of leaving her behind. So she agrees with doing everything the ex wanted, like sex. So Hizumi declared that she will discipline Shinba but not spoil him too much, so she was careful. But that doesn't mean she isn't a virgin just yet unless we get to the intimate scene which we'll get to on the later chapters. She may explain that her first was taken by her ex and was happy at first and regretted it, but that's just my assumption.
However, I could still see the comparison of chapter 26 where Hizumi pins down Shinba where her clothes are still on and on the one panel scene from chapter 29 where her panties where shown which was pretty vague. Meaning, she may have done this, like her advances to Shinba into kissing without hesitation is too obvious. It was because she was too forward.
The dad... Hoo boy, f*ck the guy. He even left his daughter and sees his job more important than his family and even got an affair like he deserves this life. I guess cheaters make the worst characters I could see the pattern lmao. The dad and the ex boyfriend are sh*t people, but still winning in life.
Like the ex-bf took Hizumi's virginity lmao.I really don't think Shinba would become such a horrible person even if he ever changes. He even swore to never hurt her, so there has to be atleast some resolution between Hizumi and Shinba where this is going with Izumi.
So yeah, I think the ex boyfriend situation doesn't matter anymore since there are only 3 chapters left. What matters is the resolution between Shinba and Hizumi.
There's going to be an update on October 5 for the next chapter maybe?