Manga 7519 Kami Nomi Zo Shiru Sekai Userrecs

It's like a crossover of Kaminomi with GTO (or other awesome-teacher manga/anime). And the execution was awesome! 

Main character is a genius otaku that only pay attention to his hobby, but they are forced to do another thing. In this task they help people, mainly girls, and the girls fall in love with the main character. 

Similar otaku protagonists who are anime/eroge fanatics. In both manga, the protagonist helps others around him by solving their problems using game tactics.  

Focusing on a genius protagonist, both series chronicles a young man as they take on the role of a conqueror. What they conquer are not territories but rather problems revolving around girls/students. Both manga likes to play out their stories in experimental format. In essence, each story and arc focuses on various aspects involving result of success/fail ratios. There's a decent amount of drama, comedy, and potential romance. The main male protagonist is mostly devoted into their duties although can be distracted by abnormal events. And based some events, somecharacters that meets such a genius develops feelings towards him. 

super otaku helping girls and getting his own harem 

Both mangas are about a genius otaku in school (great grades but extremely addicted to games(Keima) or anime (Kagami)). Both have the school setting, the difference is that Keima is a student while Kagami is a teacher. They are both entertaining and funny ^^ 

Both manga are about an Otaku who is forced to do a job which leads to him having to solve some people problems and gaining their trust and love which builds up a harem. 

Denpa Kyoushi is literally The world god only knows + Great teacher onizuka 

Amazing Romance, Protagonist does a thing for the love victimss and captures their heart, Every Arc has another girl to conquer 

Both male protagonist are otaku geeks. Both have a same goal; conquer what they need to (Keima conquer girls) and (Kagami conquer students with problems. they are quite well-known in internet for otakus. Both mangas are top 100 in mangafox.com Both lead male protagonist have at least 1 side assistant. 

Although the beginning of these two manga vary greatly, but during the process they were very similar. The male lead has some power and they both have to uses a kiss to make things work. They're both similar series involving many girls to be in love with the male lead. 

Conquests takes on an unusual from in both series. While the main male protagonist are on difficult levels in terms of intellect from both series, they do have skills in finding girls with unique personas/gifts. They accomplish their conquests by initiating kisses but the process often takes tricks, strategy, and risks for the setup. There is a decent amount of comedy in both series with minimal fan service. If you're looking for story arcs crafted with supernatural themes, check out both series. 

(a bit of harem but not really harem) romance- one definite end has supernatural parts mixed into the romance story 

Vice using game skill in th real world to concur real girls, this one brings the dating sim girls to life in the real world. Great twist and fun read. 

kami nomi is bade on galge player whod dont trust real deal girl in the real life. so both of personalities is very simillar to each other 

In The World Only God Knows (Kami Nomi zo Shiru Sekai) the main character Keima wears glasses, shy around people and prefers playing dating sims then real life. He is known as the capturing god because of the many conquests that he has done in the dating sim world. He uses the skills he learned in his dating sim games in order to win the hearts of real girls. The similarity is how serious both Ooji and Keima can become when presented with a challenge.They overcome any obstacle that blocks their main objective.  

Both protagonists have somewhat odd skillsets which they use to 'manipulate' girls. Both are also 'geniuses' in their chosen fields. Kami nomi zo shiru sekai is better though because while it starts like Kimiiro focus, it gradually develops an overarching plot over time which puts everything into focus. It is not quite as ecchi as Kimiiro focus, though it has some. 

They are both manga series about guys who are addicted to gaming and get pulled into something because of their gaming skills.  

Meet the main characters from both series that shares much in common: otaku, anti-social, and has an obsession to win games/contests. After a faithful day though, their lives changes forever.They become part of a game to conquer in order to return back to their lives. There is a lot of comedy, drama, and romance in both series. More importantly though, the main male protagonist learns more about the 3D world and those around them like never before. There are also numerous references and parodies that makes fun of the otaku culture throughout both series to spice up some fun. 

Both series are about a genius who doesn't really know/care much about human emotions/feelings that tries to capture/conquer a target (a girl) by gaining their affection, when conquered they got an overly dramatic reward from the target 

Similar in a way where the MC is going around with a cute girl from hell to conquer problematic pretty girls. Though, Kami nomi zo Shiru Sekai is a wholesome romcom while Oshioki X-Cute is borderline H. 

Being a womanizer has never been so good. With both protags seeking to become the conqueror of women, with strategies on how to do so. 

These stories have similar minded protagonists with a mission - getting close to select girls. While Keima uses gaming tropes to predict real life patterns, Ichiru uses observation and psychological tricks on people. In both stories, the MC: - starts off secluded from the world - has to get close to girls for his mission - reads people to interact with them - has no interest in anything but the mission initially but eventually changes - is fallible, takes gambles, and gets caught off guard a few times Doubt is short but has an open ending, TWGOK is lengthy and sort of ties up looses ends in a weak third act. 

Both manga has a male lead who has a harem of special girls; Kami Nomi has goddesses while Trinity Seven have mages. The male lead each made numerous of girls fall in love with him while doing it for a purpose.  

These two manga feature male otaku who one openly prefer 2D girls and the other prefer loli girls. Despite this, they still catch the attention of many female schoolmates. The MC will help out female girls making them fall for them. 

Each manga focuses on the main character trying to win the hearts of different girls. KimiKiss was based off of a "girl game" and Katsuragi Keima from The World God Only Knows is an otamegane who spends all his time playing those type of games. The World God Only Knows can be seen a satire of girl games and people who play them, but at the same time many elements connect it to KimiKiss even if it is a little less serious.