Eroge! H mo Game mo Kaihatsu Zanmai

- Collaboration Works - but is more about rape like the name suggests  

It's like an everyday kind situation in a normal series where characters have fun with each other and after some time, love arrows start to fire. Some lucky guy is blessed with such honors in both series. 'Eroge! H mo Game mo Kaihatsu Zanmai' has more scene variety compared to the lighter scene shown by 'Tropical Kiss'. 

-both hentai -both involve the creation of the hentai genre -both are quite vanilla 

- Collaboration Works - guy in harem situation - 5 bishoujos - nice animation - good quality hentai 

Sick of watching hentai full of blackmail, rape, and scenes that leave you feeling violated as you sob silently in a corner? Then these OVA's are for you. Both are based on hentai games and both are light hearted and comedic harems. Most scenes are vanilla and the characters each have different personalities (loli, tsundere, etc.). There are scenes where two or more girls will declare their love to the male MC, followed by a threesome in order to determine the 'winner'. The VA in both OVA's are amazing and really capture the characters personality. Both get straight into it and waste little time explaining unnecessary details or settings. Both have pretty good BGM. Be warned, in Dokidoki Oyako Lesson there is mother daughter incest (but it’s done rather light heartedly) and a lot of virgin blood. DOL is uncensored but H mo Game isn't (pixelated dicks I'm afraid) read more 

Both revolve around a guy and a group of girls who work on some form of drawing or animating. Manga Artist focuses on on the perverted male MC who loves drawing ecchi manga, while Eroge focuses on the group who are creating an eroge. Eroge has quite a decent and enjoyable story for a hentai. Manga Artist is a great comedy with a lovable, adorable male MC. 

Saenai is like a less lewd version of Eroge but with a better developed plot. 

Maybe if i watched this series have similar to male lead Where male lead stuck in real eroge situation and also male lead have harem plot  

this series has the same story line where players try to make something otaku, male main players have harem elements in the series, and flavored with some light pornography that makes this series have. 

Both animes have a harem. It is not as focused on that part in Eroge!, though. Beautiful artstyles and beautiful characters.  

Cute girls working in the game industry doing cute things in various situations mainly at the workplace, and sometimes elsewhere. 

Both fairly well animated hentai harem titles featuring a collection of well endowed women and plenty of vanilla sexual intercourse. 

Both have female characters with interests in Eroge. They also both have girls that wish to create a successful eroge, though it is out of the norm, being they are female. 

Koe de Oshigoto! is somewhat more soft-core version of above. Both dealing with companies producing eroge, and newcomers to those companies who are intended to revitalize stagnant situation . However Eroge! H mo Game mo Kaihatsu Zanmai is more hardcore and dealing with sexual aspects in direct way, when Koe de Oshigoto! more or less indirect, also main characters in Eroge! H mo Game mo Kaihatsu Zanmai are more mature in respect of an age and not attending high school 

- both titles collaboration works - has the same style of animation - similar character design - is around a guy in harem situation - quality hentai scenes 

same producers .. 

They both involve making eroge. This one is a bit friendlier though. no rape 

These two h-anime have a very similar setting where one is to create an Eroge the other is to create an Eromanga. They both focus on a male character that works together with various females which use him as an example for their work. As well as they're both created by the same producers so the art is very similar.  

Same art studios. Same character designs. If you like the characters/art in one, you'll enjoy the other. 

Both animes are unique when it comes to showing spicy stuff for adults with interesting concept for their plots. "Ishuzoku Reviewers" is based on an adventure of friends aiming to visit brothels of all fantasy races that live in their universe, while "Eroge! ..." mixes elements of basic slice of life and game development with hentai. Also, both of those animes are for mature viewers, but differ in intensivity of hentai stuff. "Eroge! ..." basically belongs to hentai genre, while "Ishuzoku Reviewers" is something between ecchi and hentai.