Romantic Killer was fun to watch, it's the kind of show that can be enjoyed both by romcom fans and viewers who aren't used to this genre. It is using a parody angle to build its story, and while it does work to some extent, it also has some shortcomings and I'll try to explain my point of view down below, without spoiling anything.
The show starts off with an interesting premise and going for a parody to make fun of the usual tropes we find in romcoms works pretty well, the story manages to give a somewhat believable explanation for everything that is happening. The jokes aren't that original but they are usually well executed and the cast of characters is quite likable, and while the rhythm wasn't flawless ( the transitions between the mini arcs felt a bit abrupt ), we can praise this anime for "wrapping things up" by the end of the season, meaning that there is a clear change of dynamics established and it doesn't end on a huge cliffhanger.
However, the show also did some things the wrong way, I can mainly think of two cons :
- The show will try to include some "serious" themes at times and it felt out of place compared with the overall mood of the show, who usually goes for comic vibes.
- It's linked with the other con, but in terms of pure content, the show can be a bit disappointing if you take into consideration its parody ambition. While the first episodes are rather original, the rest of the story isn't as parodic, don't expect the same level of parody you can find in a show like Konosuba.
All in all, Romantic Killer was enjoyable to watch and I'd recommend it to everyone, it might even please people who aren't into anime or romcoms since it breaks some of the codes we can find with this tag. The story makes sense and usually succeeds at making funny jokes and cute moments, and we can also thank the beautiful animation that highlights some of those funny scenes. However, this anime isn't flawless : its ambition regarding parody falls off as the story goes on, and it's notably noticeable when the show is trying to set a more serious tone in some episodes.