I Reincarnated as the Little Sister of a Death Game Manga’s Murder Mastermind and Failed


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One day, Mai remembers that her perfect stepbrother is a character in a death game manga and that one year later he will hold a death game involving all of his classmates, killing his sister in the process. Mai plans a variety of surprises for her stepbrother every day based on what he said in the manga, “Nothing unexpected happened, so I was bored,” but as the days go by, he begins to show abnormal signs…

Only I know what my brother’s really like!

Associated Names
One entry per line
Desugeemu manga no kuromaku satsujinki no imouto ni tensei shite shippaishita
Desuge Imouto
Related Series
I Thought It Was a Fantasy Romance, but It’s a Horror Story (2)
You’ve Got The Wrong House, Villain (1)
Surviving as a Maid in a Horror Game (1)
Recommendation Lists
  1. Yanderee~ (*)
  2. Bloody Road
  3. Rating Male Yandere Works
  4. josie/shoujo 2
  5. Horror and Horniness ~ A collection

Latest Release

Date Group Release
05/26/22 ChocoCats c30
05/10/22 ChocoCats c29
04/25/22 ChocoCats c28
04/25/22 ChocoCats c27
04/19/22 ChocoCats c26
04/12/22 ChocoCats c25
04/06/22 ChocoCats c24
03/14/22 ChocoCats c23
03/10/22 ChocoCats c22
02/27/22 ChocoCats c21
01/13/22 ChocoCats c20
01/13/22 ChocoCats c19
01/13/22 ChocoCats c18
12/13/21 ChocoCats c17
11/25/21 ChocoCats c16
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11 Reviews

New MusicFromMil
Jun 10, 2022
Status: c30
The other reviews were right. This turned out to be unexpectedly wholesome and cute with some dark tones here and there. A very intriguing story to read, the brother is a true (almost) unfeeling psycho to the core
0 Likes · Like Permalink | Report
Aug 30, 2021
Status: c4
The plot is very intriguing and feels fresh from other reincarnation novels due to the sense of twistedness and danger. It kinda reminds me of Future Diary because of the genre.

The psycho brother is really scary and the sister just began with her operation to make things more entertaining for him. I am not sure if there would be romance developing from the two characters since they're not blood-related siblings. Or if the obsession with killing would persist with him until the end.

Excited to read the next chapters. ^^
25 Likes · Like Permalink | Report
Sep 27, 2021
Status: Completed
This is the absolute cutest thing ever. If you don't mind MTL just read it on syosetu using chrome page translation. Some parts are a bit hazy but it doesn't get in the way of overall comprehension. The only bad part is that it's too short, because some of the more intense emotions could totally benefit from a little more development.
16 Likes · Like Permalink | Report
Dec 09, 2021
Status: Completed
I love it~

It's so cuteee~

    • In the beginning, the brother is lifeless like robot but after the incident, he slowly transformed into yandere for mai. I love his internal monologue which goes like, "If you didn't want mai's life, give it to me. I will treasure her." (
      ) awww
    • The sister (mai) is not normal either. I mean, you know your brother is going to be murderer and the first thing she do is trying to make life fun for her brother. Honestly, even after she remembered the past life, she is still considered a brocon (but she didn't realize it)
12 Likes · Like Permalink | Report
Oct 03, 2021
Status: Completed
This was actually pretty cute? I still don't really understand how the brother fell in love with the MC but their relationship is pretty cute, albeit strange? After all the brother is a yandere and the MC seems to be a little crazy too...
12 Likes · Like Permalink | Report
evryday we fall lower
evryday we f
Mar 17, 2022
Status: Completed
I liked it. Has a surprisingly cute and wholesome conclusion for a story with a yandere ML. The pacing of the story is decent. Its fun to see Makoto (the ML) go from "everyone can die and I will enjoy it, " to "ew, FEELINGS for another person?! Gross." And Mai's attempts at surprising Makoto to make his life less boring just to prevent him from becoming a murderer are so entertaining. ... more>>

And what's great is that before either of them realize it, her plan sorta works! Not the way she intended, but hey, what's important is that he doesn't become a mass murderer.

I also liked the balanced distribution of his POV and Mai (the FL) 's POV. It was refreshing.

I would also like to add that the translation so far by Chococats is very good. Reading thru MTL just made me excited for their translations of later chapters because I know the experience will be much better when I fully understand the dialogue. I can get the gist of it through MTL but its not the same. Especially when ".... hah?" google translates to "..... teeth?" and "Mai, " translates to "dance." It's kinda funny because it sounds like Makoto keeps telling Mai to dance at the most random moments. <<less
10 Likes · Like Permalink | Report
Feb 20, 2022
Status: Completed
It's surprisingly cute?!

I've read the manga (There are 2 available translated chaps) and fell in love with the concept! 🤩 By the time of this review, the translated chapters of the novel is just until chapter 20, but I can't wait so I MTL'd my way towards the ending.

It's not recommended to MTL it because it's confusing somewhat, especially when it gets to the brother's POV, although you can get the gist of it especially if you're an experienced MTL reader 😂. It might be at the way that the... more>> characters uses terms and pronouns, since the JP language does have it's complexity when it comes to using terms. Oftentimes, there's no specific pronouns at all in the sentence and the translating system adds pronouns by itself, which makes the scenes a bit confusing.

That aside, THE STORY IS JUST SO CUTE!! 💕 The brother is a psychopath then he was circumvented to become a Yandere, although that wasn't what the MC planned. The MC is also very quirky and weird because normal people would opt to stay away from psychopaths, but NOOO, the MC did various stuff to try to "surprise" her brother so that her brother's classmates will somehow be saved (?). It's weird, yes, but this story focuses on the gradual closeness of the MC and her brother, which is hella cute in my opinion. For people who likes Cute Yandere/Obsessive Characters, try to give this one a go. 😉 Sadly, it's a short novel and I really wished there was more. <<less
9 Likes · Like Permalink | Report
Nov 07, 2021
Status: c23
It's really good, I remembered this novel when I was browsing on one of my most-visited manga pages when I saw the title and was reminded of this, this, great. It's really interesting, I was always into this type of novels and characters like her older brother are my absolute favorites. I like how she tries to prevent it and isn't full on horrified of what he's done- or, should I say? Will do. Since the title does say she failed. Still waiting for more chapters.. Im kinda going to... more>> rot here. This novel is good. Non-debatable because it is an undeniable fact.. Okay! Update, Ch.23. This just keeps getting better and better!! <<less
9 Likes · Like Permalink | Report
Oct 23, 2021
Status: c12 part2
Honestly I’ve read the first 2 Chapters of the Manga and was hooked and immediately searched for the novel.

I really like the flow of this Story because this isn’t about romantic love at first, she has a reason for doing all this and the surprise effect and her acting all eccentric is funny to me because I’ll think..

„What does he think now?“
4 Likes · Like Permalink | Report
Jan 24, 2022
Status: c20
Such a unique and thrilling concept that pretty well written! This novel really pulls knee deep into the story! Just wishing there were more chapters out but it's very good so far! Highly recommend
3 Likes · Like Permalink | Report
May 13, 2022
Status: c29
I love it so much! The MC is very cute and energetic, I really love MCs like her, while the yandere ML is very wonderful too ~ love how he slowly gets touchy with the mc! I can't wait to see more of them (`∀´) plot is very interesting and unlike other isekai stories

The translation is very wonderful too! Very easy and smooth to read! I always look forward to reading chococat's translation!
2 Likes · Like Permalink | Report
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