First off, it's a doujinshi—not a manga. Then, I don't know why it is tagged as "rape" and "incest" as it has neither. If you read it carefully:

> Next, we'll talk about the "room you can't leave until you have sex"

> which as introduced as a measure to address the declining marriage rate and birthrate

I don't see why I wouldn't use this as an example.

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BigTTYGothGF 3 days ago | parent [-]

"Doujinshi" is a method of distribution, not a medium.

> I don't know why it is tagged as "rape" and "incest" as it has neither

Incest: The dramatis personae (https://nhentai.net/g/609087/4/, mostly SFW if your boss doesn't mind fully-clothed underboobs) introduces the characters as step-siblings. (And page 11 the male character refers to the female character as "family".

Rape: The premise is inherently rapey as one is not allowed to withdraw consent after entering the room. Also the bottom of page 15 the male does not look like he had consented to the events of that page and the previous.

	▲	koakuma-chan 3 days ago \| parent [-]
		> Incest: The dramatis personae (https://nhentai.net/g/609087/4/, mostly SFW if your boss doesn't mind fully-clothed underboobs) introduces the characters as step-siblings. (And page 11 the male character refers to the female character as "family". It's not "incest" if they are not blood-related. > Rape: The premise is inherently rapey as one is not allowed to withdraw consent after entering the room. As I understand it, entering the room does not constitute giving consent, and one can withdraw their consent any time, which the protagonist chose not to do. > Also the bottom of page 15 the male does not look like he had consented to the events of that page and the previous. The way I read it, especially with previous two pages in mind, it appears to me that he does not mind.