Unlike most here, who i'm sure mostly have relative-to-other pinku / erotica films comparatives, experiences to share, and film-criticisms/film-praise of it's multiple blended genres,
the first thing i thought of ( guilty-puppy look ) that i should make a point about in a review here, was from perhaps the under-developed porn directer in me,
That in the first sex-scene with the Kappa, he seems perfectly fine, with being shown the front door, instead of insisting on the rear,
which, although i believe not-explicitly always-consistent? In the myth/lore? I.e. Sometimes shirikodama are not a part of the myth at all, and it might only be a partial occurrence? / was only sometimes present, presumably in the more monstrous portrayals?
... would nevertheless,.. mm... make sense, to be of primary-interest / natural-instinct, would it not?
Considering the normal location of the also-mythical shirikodama?
I.e. If they're normally getting in there for sourcing their mystical power... surely the front door's of little interest?
Is our contributing to society hero-of-a-Kappa, meant to be an exception to the rule?
He is also quite passive / not very proactive,
so perhaps he was meant to be cast that way?
:) OK then, but it does detract from the original creative-CONCEPT a bit, for the ever/always 'with-a-bald-spot' (hint) creatures, to be OK with risking ending up with more mouths to feed, or whatever else, transitionally.
Using metaphoric transitions is always fiddly, i just wondered if it might've been a production oversight / deliberate. If there's further movies like this / any sequels, you might want to ... 'stick to what's consistent between us all'.
Hrrrrmph. Never invite a history-student to a musical.
Didn't-know-how-to rate / probably shouldn't've rated this, so i gave it a 5/6.