Omae wo Onii-chan ni Shite Yarouka!? - Volume 1, 11th of April, Thursday

Genius Female Forensic Scientist VS Tough Criminal Police Captain[Mystery + Detective + Sweet Romance + High-IQ Crime + Serial Killings + Psychological Profiling + Suitable for the Faint-hearted]Schizophrenia, antisocial personality disorder, high-IQ crimes… This is a world where psychopaths run rampant.The Cat Fetus Case, the Lovers’ Butcher, the Angel of Death… Evil delusions always invade reality, accompanied by violence.Their First Meeting:Mu Mian asked very sincerely, “Hello, would you be willing to donate your body to me after you die?”Later:Fang Rui: “If I fell into the water along with a victim’s corpse, which one would you save first?”Mu Mian: “You!”Fang Rui looked at her with some surprise.Mu Mian: “Because the corpse will float by itself~”

Tachikawa Shin always thought he was a decent, upright man—unfortunately, he’d been saddled with an indecent favorability system.Raise others’ affection to grow stronger?“I’d rather stay away from these witches, but this concerns my safety and physical integrity... Well, it seems I don’t have a choice,” Tachikawa Shin said righteously, with absolutely no perversion whatsoever.All hail the Rizzler!

In novels with a stud there is always a Senior Martial Brother like this:

In the early stages of the novel, his innate talent is high, his cultivation is good, his appearance is handsome, and he has an intelligent, cute younger Martial Sister as a fiancée.

In the middle stages of the novel, he is caught unprepared and defeated by a young disciple (the protagonist) in the sect who’s hardly remarkable at all. From then on, he falls from his godly altar and loses his brilliance. Even his young Martial Sister leaves him for someone else.

In the late stages of the novel, he continues to turn dark, going down the Demonic Path and becoming the major villainous boss. However, the protagonist still ruthlessly defeats him and his soul is eternally sealed.

Once Qin Mo opened his eyes, he discovered that he had become this Senior Martial Brother.

- Description from Novelupdates

My name is Kaelith Yurei , and I am a first-year student at the Shin'ō Academy in the Soul Society. I have a friend who is destined to be quite famous in the Soul Society; his name is Sōsuke Aizen.Unlike this ambitious and idealistic friend, my goals are quite simple: through hard work and diligence, I aim to graduate and become a seated officer in the Gotei 13, from which point I will… I bounded with who!?Whenever Aizen enhances his strength, my power automatically synchronizes to match his level.Therefore, what I need to do from now on is very clear.“Sōsuke, you need to work hard. As long as you put in enough effort, I can live the life I desire!”