I'm not sure specifically what 'Cap deage' means. It could be a very specific term, a misspelling, or something relatively unknown. It might be a proper name, a local term in a certain area or a very niche concept.
I'm not sure specifically as there could be many novels with this title or concept. It might be about a story where the so - called 'love' is false and there is an overflow of this false love situation, perhaps in relationships that are full of pretense among the characters.
Not having read the 'overflow with fake love novel', it's impossible to accurately name the main characters. However, in a novel with such a theme, we might expect characters who are either victims or perpetrators of the false love. There could be a naïve character who falls for the false love easily, and a manipulative character who spreads this false love for their own purposes. Maybe there's also a character who discovers the truth about the false love and tries to expose it or break free from it.
It could be that the market demand for their visual novels declined, so they decided to stop. Or perhaps there were internal problems within the company that led to this decision.
The cap man and monkey story is an interesting one. There was this cap man who was traveling around selling his caps. He reached a place near a forest and decided to take a rest under a tree. While he was sleeping, the monkeys in the tree noticed the caps. They climbed down, grabbed the caps, and went back up the tree. When the man woke up, he was confused at first, then saw the monkeys with his caps. He was worried as those caps were his livelihood. But then he remembered that monkeys often mimic human actions. So he took off his own cap and tossed it. The monkeys, being the imitators they are, did the same with the caps they had taken, and the cap man got his caps back.