If you liked
Kimi no Koto ga Daidaidaidaidaisuki na 100-nin no Kanojo
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...then you might like
Shijou Saikyou Orc-san no Tanoshii Isekai Harem-zukuri
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Both involve a confident but nice mc building his harem. Both have very funny comedy with a variety of girls. Both have great art and really cute expressions. Main difference is where 100 Kanojo is a high-school setting, Orc-san is a fantasy isekai setting. Also, in the later the author cleverly blends in a variety of classic other tropes like cooking, medicine, politics etc without it becoming boring.
If you liked
Kimi no Koto ga Daidaidaidaidaisuki na 100-nin no Kanojo
|
...then you might like
Yankee JK Kuzuhana-chan
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Both feature MC with an ever-growing number of effectionate harem girls. Both have some fun ecchi and really good comedy. 100 Kanojo is superior on all fronts but Yankee JK is also unique and does try to lead towards a clear harem "winner".
If you liked
Kimi wa Midara na Boku no Joou
|
...then you might like
Takane no Hana wa Midaresaki
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Both are borderline titles but with surprisingly wholesome themes. Takane no Hana wa Midaresaki involves some S&M. Kimi Wa Midara Na Boku No Joou has supernatural elements but is a shorter completed manga.
If you liked
Boku no Kokoro no Yabai Yatsu
|
...then you might like
Ookii Kouhai wa Suki desu ka?
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Both high-school romcoms focus on the super-sweet romantic interactions between a shorter MC and taller FMC. Both have a short episodic manga style although still with some nice story progression.
If you liked
Golden Time
|
...then you might like
Horimiya
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Both are complete romance stories covering actual relationships. Lots of romcom humour and story progression.
If you liked
3D Kanojo: Real Girl
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...then you might like
Horimiya
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Both are complete stories set in high-school covering actual relationships (not just the lead up to it). Both involve an introverted 'quiet' MC and extroverted 'popular' FMC.
If you liked
Hori-san to Miyamura-kun
|
...then you might like
Boku no Kokoro no Yabai Yatsu
|
Both are diabetes-including romcom wholesomeness with an introverted character getting to better know an extroverted one.
If you liked
Komi-san wa, Comyushou desu.
|
...then you might like
Boku no Kokoro no Yabai Yatsu
|
Both involve diabetes-including romcom wholesomeness with an introverted character getting to better know an extroverted one. Styles are similar - more than 4-koma but less than full manga.
If you liked
Yankee-kun to Hakujou Girl
|
...then you might like
Tedama ni Toritai Kurokiya-san
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Both are genuinely wholesome romcoms featuring unlikely pairings dealing with some prejudiced perspectives whilst still retaining a strong fluffy romance feel.
If you liked
Hajimete no Gal
|
...then you might like
Tedama ni Toritai Kurokiya-san
|
Both involve a romantic relationship between a "gal" and a high-school guy. Although the mc in Tedama ni Toritai Kurokiya-san is more straight-forward compared to the classically insecure mc in Hajimete no Gal