Man It's so refreshing to see an MC falling all over a flat-chested girl. Most MCs aren't even affected or bothered, as if they were less feminine or not attractive at all.
This is also one of the few ecchi manga where the MC confesses his feelings early on. He makes very clear that he likes her, but she still remains a tsundere so it takes her a while to accept that. But at least he's not a chicken MC like 90% of ecchi manga MCs lmao.