Mediocre Haru Shibasaki exposing her chest to enter the men's bath, even if her breasts are small, is a stretch. The setting lacks realism. This could be called a variant of the "one towel" situation.
What I dislike most is the flow where she reluctantly complies. I think Haru Shibasaki is an actress who suits a more proactive attitude, like when she "unlocked gokkun." For example, a scenario where she takes the initiative when about to be discovered, saying "If you don't tell anyone, I'll let you cum," then guides them with "The water will get dirty, so cum in my mouth," and swallows it—that kind of development fits her appeal better. Furthermore, if she gets caught by a large group, a setting where she turns the tables and says "Fine, I'll make you all cum," dominates everyone, and then leaves would suit Haru Shibasaki's character much more, wouldn't it?
Also, the unrealistic creampie is unacceptable. Given the location, it lacks realism. A flow where she makes everyone cum in her mouth and then swallows it all to destroy the evidence would be just right for Haru Shibasaki.
A bit forced. If the character's gender identity were male, that would be one thing, but when a character who has been clearly depicted as a woman suddenly introduces transgender elements, it inevitably kills the mood. However, the way a tough-talking but actually fragile small-time character is portrayed in defeat is very skillfully done, and I can honestly appreciate that point.