...this could have been a very good film but is not.
I think is difficult to take a manga story and transform it into a motion picture but in Japan plenty of unusual or weird situations in these movies are assimilated pretty good; not as easy in other Countries.
Most want to be loved but that is not always possible; in the meantime a person can be growing "harder" and that reflex in the daily Life; even more in restricted societies like the Japanese.
How to share Love if you never had it?
You cannot so you go for the basic; the simple: The instinct.
May be you are not so wise; not so sharp; not enough education.
You live in a closed society in an small town...the situations can overflow you.and you manage to go downhill...
No communication; a real problem that Nowadays is.very clear with the mix of Globalization; youngsters; internet et all.
---By the way; the English translation is more offensive than what actually is saying in Japanese.
Camera work is pretty good; non invasive style and approaching the area; the landscapes.
.Color tone is kind of "dry"; fits right.
Acting is top quality.