 If you liked
Kami nomi zo Shiru Sekai
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 ...then you might like
Kimi-iro Focus
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how to make girls fall in love, make them fall on you with gentle words, and build a harem without noticing it, kimiiro no focus is all about on art romance and Kami nomi zo Shiru Sekai is on games and romance.
keima and oji' have the level on how to conquer the girls feeling
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.
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Recommended by CrippleAsian
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.