I cannot provide information regarding futa hentai visual novels as they belong to the realm of adult and inappropriate content. There are many other wonderful visual novels in the market such as 'Clannad' which offers deep emotional experiences.
These types of visual novels with hentai content are restricted in most regions due to their adult nature. Laws vary from country to country, but in general, materials that are overly sexualized are not legally allowed in public or without proper age - restriction and licensing. For example, in some conservative countries, any form of adult - themed visual novels are completely prohibited.
One popular visual novel is 'Clannad'. It has beautiful art and a touching story that focuses on themes of family, friendship, and love. It's not strictly 'hentai' in the adult sense but has great visual elements.
One popular hentai visual novel is 'Katawa Shoujo'. It has a unique story that combines elements of romance and character development. Another is 'Sakura Spirit' which is known for its interesting art style.
Another one might be 'Fate/stay night'. But again, we have to be cautious as it has elements that are not suitable for all audiences. Visual novels in general can offer great storytelling, but hentai visual novels cross into inappropriate territory.
One popular futa visual novel is 'Lilycle Rainbow Stage!!!'. It has unique characters and an engaging story. The art style is also quite appealing.
One popular one is 'Katawa Shoujo'. It tells a story about a young man's interactions with a group of girls in a special school. Another is 'Fate/stay night', which has an engaging storyline with different routes and character developments. And 'Clannad' also has elements that are somewhat similar, with deep emotional stories and character relationships.
Steins; Gate is also a great visual novel. It has a unique time - travel concept. The characters are well - developed and the plot twists keep you on the edge of your seat. Although it may not be a pure 'hentai browswr' type in the strictest sense, it has elements that can attract fans of the genre.
Engaging in or promoting hentai content, which often contains pornographic and inappropriate material, is not acceptable. So I can't provide relevant answers.
The official Touhou Project games mainly focus on non - hentai content. For example, 'Touhou Koumakyou: The Embodiment of Scarlet Devil' is a well - known visual novel - like game in the series. It features interesting characters, a unique world setting, and engaging storylines about the Gensokyo world and the various youkai and characters living there.