I see, everyone has their preferences and I hate this one because I hate stories with cheating(specially on nice MLs)
I mean akuheki is definitely very extreme. But if we're going to compare two extreme things along with psychological stuff then I still found akuheki much more interesting and better. Even though the characters SPOILERS
keep talking about killing and dying and the desire to make specimens lol, they never actually go through with it and the ml actually makes the mc heal his scars. It's weird but endearing specially in the later volumes. The way they both have deep traumas and work on each other to be better.....they care so much that they're ready to take pain from others to save each other, it just hits. Not to forget, it has an intricate and deep storyline, especially about mc's father. It's still ongoing n I'm looking forward.
Read akuheki instead.