Shadow Monarch's Requiem - Chapter 2: The World That Forgot Me

Chu Yunsheng’s head hurts every time he wakes up. Because he is usually either lying in the villain’s bed, or had just gotten up from the villain’s bed.

The reason why villains are called villains is because they are extremely lethal and vengeful… and they love to blacken…

Villain: Bastard, I will castrate you!

Chu Yunsheng: …Oh.

- Description from Novelupdates

Kusumi Chiharu gets a message one day that he has been selected as a Monster Tamer, and he is prompted to select his first partner. He thinks little of the message until he receives a giant package the following day. He assumes it’s the porn books he ordered, but the huge box ends up containing the unconscious body of a near-naked girl! She’s a ghoul named Zonmi, who intends to fight beside him as his partner.

However, it turns out that other hot girls at his mostly-male high school are also magical entities, and Zonmi may not be the only one who wants to fight by his side!

“Hey, Yoshi-kun. I think you’re——”

Hearing that voice for the first time stopped me in my tracks. On my way home from school. On the playing field of our junior high, and at the bookshop in front of the station. And then in the empty lot where the white cat slept. Shiina Yuki, the strange girl who somehow knew all about me, always approached me like that.

We laughed, cried, got angry, held hands. Again and again, we repeated those disappearing memories and ephemeral promises. That’s why I never knew. I never knew the value of Yuki’s smiles or the meaning of her tears. Nor even the singular sentiment behind her many ‘Nice to meet you’s.

This is a captivating, heartrending tale of meetings and partings.

I don’t need companions. I don’t do party play. But… the game forces party play?