MTL - I Was a Top Student In Conan, But I Was Actually An Onmyoji - Chapter 344

A bloodsucking mosquito with the soul of a student, seeking revenge, rose from being weak to powerful, step by step from this unassuming life planet 'Earth', becoming a powerful force in the entire universe!Literary version: Reborn as a larva, striving for self-improvement, and ultimately transforming into a terrifying giant mosquito. From then on, I roamed freely across the universe, traveling the vast universe's starry sky!Passionate version: You weak cosmic creatures! I'm using my mouthparts to consume the core nutrients of your mother star. What can you do about it?Funny version: You think I'm disgusting? You hate me because I suck blood? Want to swat me dead with one slap? Just wait, one day I'll stomp your house down!

Samuel, a high schooler, got summoned with his classmates to another world as prophesied heroes. He expected glory, adventure, and a chance to save a kingdom. But those hopes were shattered when he discovered the truth, they were sacrifices, the gods who summoned them are no saviors, but monsters that feed on human souls. Among the victims is his little sister, dragged into the summoning by accident while she was delivering his lunch. Betrayed and marked for sacrifice, Samuel survives andmade a deal with (Arithmos) the God of war, with its power, he now vows to destroy every god and declares to take everything from them.

A girl who calls herself a demon appeared before a timid student named Fumio Kijima. The girl claims to be a campaign girl from the demon world and she gives him the ability to “summon a room” from nothing but thin air.

At first he doesn’t abuse his power and uses it as a convenient ability in his every day life. But one day he is bullied by his classmates under a false pretext and is made to suffer. In the past he would have wallowed in misery and cried himself to sleep, but now he had a power to call upon.

“I will make them regret it!”

Using his powers to summon his “room”, he begins his era of confinement and brainwashing to achieve his goals.

You Liangxing would never open the speech function in game.
That was because his voice was…
Particularly! Kittenish!

But there was one day, he queued up with a teammate who had so much to say that they may as well explode. Vexed to the point of no return, he contributed a voice that was capable of splitting heaven and earth, “Don’t BB.”
The other party who was being scolded stilled. In the ensuing silence, he suddenly let out a long, relishing… Moan.
You Liangxing: “…..”

Later —
He realised that the person was a great god,
Much later,
Without him realising,
He became the great god’s royal healer.
…. And also his boyfriend.

- Description from Novelupdates