Koi wa Sekai Seifuku no Ato de

The main plot of both shows is a love story between two people belonging to opposing factions who try to hide their relationship from others to maintain their love. 

Very similar premise, with a forbidden love/relationship between two leader of rival groups/gangs. Both have a dark haired tall guy and cute blonde girl. 

Forbidden love rom com between guy and girl from opposing factions. They're all flirty and wholesome when they're alone but have to pretend to fight when others are looking. Boarding School Juliet is more serious while Love After World Domination is more SOL. 

A love story between two opposing group leaders who must keep their relationship hidden in order to protect it! Both stories are cute and wholesome. "Love after world domination" feels like the "Power Ranger" version of "Boarding School Juliet" lol... 

Enemy to lovers Forbidden love/Relationship between 2 Leader of different Country/Group Both try to hide the fact that they are dating in secret Both story is wholesome (Love after world domination) has similar vibe to boarding school juliet but in Super sentai version . If you like boarding school juliet then surely you will like Love after world domination . 

the concept of both animes is literally the same, both of the couples in respective animes hiding their forbidden love, with tons of wholesome cute, and funny vibes throughout, really would recommend this 

Both shows are about two people from groups that are hostile towards one another. They have to actively hide their relationship from others.  

ENEMY TO LOVERS  

MC falls in love with his opp 

Two main characters are enemies but fall in love and start dating. And both are Romcoms with no drama and a little bit action. 

Love between rivals that starts early  

These two anime got similar story line... starting as enimy and ending as lovers... early romance animes and good story line... 

A sweet love story at first sight between sworn enemies in their position. Both series fit this description. They are also united by the fact that humor is built around the need to keep a relationship a secret, but the characters do not do it well 

Both of these series have the "forbidden romance trope" where in both of the main characters are from organizations that oppose each other, yet still being in a relationship. Katsute Mahou Shoujo to Aku wa Tekitai Shiteita is basically a better looking and more diabolical romance anime with the same tropes. However, MahouAku also has better character design and goes into more in depth on the lives of the main characters and gives more development in their relationships. Katsute Mahou Shoujo to Aku wa Tekitai shiteita is also a tribute to the late manga author Cocoa Fujiwara, and this show was the manga she was publishing before her death. So this show is pretty damn peak. read more 

They're both romance between a dude who is obsessed with a single hobby (they even look similar) and a hot blonde gyaru girl who's into cosplay and is obsessed with the guy. 

Simplistic enemies to lovers romcom dumbfuckery with a slice of (equally simplistic) topic/world flavouring. The romances play out a bit differently, but they have similar vibes. 

Both series use Tokutatsu tropes to parody certain genres (the workcom for Kuroitsu-san, the romcom for Love After World Domination). 

Both involve two people that are natural enemies. But instead of being enemies, they end up forming a loving relationship with one another.