A comment that I found from Facebook, shoutout to Bambang Ariwibowo for reading the novel
Huge Spoiler ahead
i'll tell you what happened.
(including spoiler from WN. read at your own risk, or get away)
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basically : the duce beg hero (Ryuguin) have a skill and smart enough to hid it and use it as means for brainwashing every female/heroines around MC (Yamada)
it's so meticulously well prepared process and precise series step of suggestions to actually make those heroines to completely forgot about Yamada and his achievement, so far as obeying all duce bag hero said (3 heroines are getting violated in bed to)
furthermore, duce bag hero and his harem, bullying Yamada to the point he got a severe and serious mental, health, physical damage.
so severe that he forgot how to move.
Journey to revenge is loooooong and painful.
in the end...
the author makes all the heroines (who snapped out of the duce bag hero charm) get their "remorse" put in detail.
and it's something readers could finally said "yeah f u all, btch!!" "f off used garbage"
(but Yamada is too kind as expected of holy knight)
And ultimately. the most satisfying part is the duce bag hero's punishment.... and he will not able to utilize his schlong ever again (including any desire and luxury as even mere living thing)
forced to clear every dungeon that Yamada have cleared (with difficulty level : myth)
the duce bag stuck on first dungeon without ever have a mili atom of courage to face even first floor boss.
*but first and foremost. behind all Yamada's great recovery from his vegetable state, there's one very best girl in the whole story.
she's the only one for Yamada.
and she's OP even her shikigami is enough to beat all "charmed" heroines into submission.