No, this is stupid internet misinformation. Carrot is a cartoon character and isn't from Japan, to begin with, but Japan takes sex crime seriously. The Japanese porn industry is MUCH better than the porn industry in the US when it comes to respecting sex workers.
Japan leaves the age of consent up to individual prefectures, and has a national age no one can go below. So, Tokyo, for example:
"Japan statutory rape law is violated when an individual has consensual sexual contact with a person under age 13. At 13, Japan's base age of consent is the lowest of any developed country. However, many prefectures also have local "corruption of minors" or "obscenity statutes" (淫行条例) which raise the de-facto age of consent to 16-18, unless they are in a "sincere romantic relationship", usually determined by parental consent. For example, the effective age of consent in Tokyo by local statute is 18. The age of marriage is 16 for girls and 18 for boys with parental permission, and 20 otherwise (as stated in " ナス邃「窶慊カ窶「ナクナスニ停?邸", the Child Welfare Act of Japan."
Japan is a great country, though not perfect, who takes protecting young people seriously. Anime isn't real life. If you try to hit on 13-year-old girls in Japan, you'll get arrested, as you should be.
I don't care if people simp for a cartoon rabbit, but there is NO way a 13-year-old should be doing things with a grown-ass-adult, and most Japanese know that.