Reitama's manga / #Ninja(1)

I do apologize for rating this manga lower than 5 stars. It's a wonderful manga, but I feel that I've already read something similar to this. ✧Spoiler Alert✧ Ch. 1 - Chouko has an aide that appears from nowhere and has an obsession with her... Ch. 2-3 - Keeps adding to her harem of men. ╮(￣▽￣)╭ Ch. 4-6 - Momnapping a kid's mother and feeding her poison... then breaking the mom out of hostagity. *it is not a word. Ch. 7 - Partying and getting hated by someone you barely know and interacted with is really troubling... Ch. 8-9 - "Karen this... Karen that..." What's with the referring yourself with 3rd person speech? I have to say, Karen is quite a self-centered bitch. Those characters are almost everywhere in Mangas...