The Primordial System - Chapter 40: Arena

A Federation Colonel with abnormal thoughts was locked in a dark room and met a little looney.

“Your whole body emits a scent that I dread (covet) and fear (desire).”

A frigid Colonel X little looney roommate: A sweet story of interstellar travel

- Description from Novelupdates

The protagonist, Winnie (文尼), confesses his love to his childhood friend—the princess he’s been secretly in love with for years—but is brutally rejected in public. His heart shatters, he’s humiliated and ridiculed, and he collapses unconscious. When he wakes up, he vaguely remembers his past life’s memories and realizes he has transmigrated into the world of an otome game he played before. At first, he’s thrilled, thinking, “Nice! I must have been reincarnated as a villainous side character who disrupts the protagonist’s romance, right?” But then… surprise! He’s not just the villain—he’s the “Saintess”!

Tyler thought he had everything: good grades, a loving girlfriend, and a picture-perfect life. But everything shatters when an anonymous text warns him that his girlfriend, Alexis, is cheating. Dismissing it as a prank at first, Tyler’s world is turned upside down when he catches her in the arms of Logan Carter—the arrogant, untouchable captain of the football team.Heartbroken and humiliated, Tyler finds himself tangled in an unexpected game of cat and mouse with a mysterious texter. But things take a surprising turn when Tyler discovers that Logan was the mysterious texter all along. Fueled by anger, confusion, and a strange attraction he can’t explain, Tyler demands answers—only to receive an unexpected confession and a kiss that changes everything.

Akira Kuromiya is just an average high schooler who gets killed by a robber. He wakes up and is now a chicken!? Even worse he becomes the familiar of a girl who's apparently the heiress of a powerful clan.

That was for a short while though, as he was abandoned and woke up to find out he, now she, is trapped in a deadly magical forest with all sorts creatures trying to kill her.

The world she finds herself is one of magic and monsters like the manga she's been reading. Akira, now Hinotori is trying to live her life as a chicken in another world!