One day a highschooler saves a child from being hit by a car, (did he just save someone from being isekaied and having an awesome life as an OP AF MC? Who knows? That’s not important) as a “reward” he gets into a coma and his body lies in the hospital bed. His… spirit? Mind? Soul? Whatever, gets sent to a fantasy world where he starts his new life as an adventurer. A not OP at all adventurer who gets into some serious trouble. Lucky for him, his sister arrives in the same world to help him. How? By hitting her head on the wall until she gets into a coma herself I guess. Unlike her brother, she’s overpowered af, quickly saves our hero and… demonstrates she has some serious case of a brother complex. From that moment on the siblings begin their new life in another world.
“My One-Hit Kill Sister” is a fantasy, isekai comedy with some ecchi elements to it. Because it lacks a main goal for its characters it’s mostly episodic. The previous episodes have little influence over the later ones. They aren’t completely self-contained but the watch order isn’t as important as in a show with an overarching plot.
There are two main characters that the plots revolve around.
Asahi - technically our MC with power levels that makes Kazuma from Konosuba seem like Conan the barbarian. For reasons known as “plot bullshit” he is given credit for his sister's deeds which makes him jump in adventurers ranking. He has more luck (both bad and good) than anything else, but he’s not a total moron. He’s aware of his place in the food chain and wants to get stronger but because of bad luck he lands himself in a lot of trouble. Luckily for him his sister has an unhealthy obsession with him and always saves his ass.
Maya - obsessed with her younger brother Asahi, young woman with power levels normally reserved for protagonists of shitty written self indulgent power fantasies. When I say “obsessed with her younger brother” I really don’t give it justice. To be with Asahi she inflicts blunt force trauma repeatedly to her head just to end up in a coma. In the new world, for some reason, she’s OP AF, which is lucky for Asahi because she is more than willing and able to save him from any danger. She also has a habit of adding “Big Sis” in the front of her attack names… yeah… make of that what You will. That said… she does want to go to incest town with her little brother (and judging by some of his actions and reaction I would say he isn’t 100% against the idea) and often uses her advantage over him to hug, cuddle and grab his ass. With a sister like that, who needs enemies?
There is one more character that we meet pretty early and she does appear often so I’m gonna add her to the list, even though she has a more supporting role.
Kilmaria - basically a demon version of Maya when it comes to power. She’s one of the Demon King's officers. Ok, seriously, why does it always have to be a Demon King or Demon Lord? Why not a committee or a democratically elected official? What’s with demons and monarchy? She has a major boner for fighting strong opponents which is why she quickly develops an obsession with out main siblings and tries to fight Maya on many occasions and often saves Asahi from trouble and even acts like a substitute sister.
When it comes to writing the show is a mixed bag. On one hand there isn’t much originality when it comes to the situations our heroes get into, on the other, the execution of them and the little twists are solid. The lack of main goal allows the show to experiment both the genres of episodes (most are still just pure comedy) as well as modify the group dynamic and the amount of characters. When a character is not needed they just disappear doing their own stuff without the need for the waiver to give a damn about it. It is a solid (but not great) substitute for a coherent, overarching plot line.
The drawback is that most of the episodes follow the same main route. Get a quest - fuck around - find out - get rescued by the sister. It is repetitive but thanks to the fact that the show has only 12 episodes it isn't as infuriating as it could be if it had 20 or more. It does however make it feel like it overstays its welcome a bit (about 1-2 episodes). Especially because things don’t really change. Asahi does get stronger over those 12 episodes, that is something that I can, and will, always commend - having a hero who actually evolves. But despite that his place in the group and the amount he contributes when shit hits the fan, doesn’t. Maybe except the last episode where he has a chance to shine.
The show is a dumb comedy (to be honest I sometimes got a flashback to Konosuba, especially in the way our main duo gets a house) and wears that on its sleeve and that’s something I can respect, even if the writing isn’t something to write home about. If You want some dumb fun without the need to remember details from previous episodes, You will have fun with this one.
