TheDragonSlayer

“Ah... foolish hero, come to slay me... Heed my command and kneel!”

The Demon Queen offered Ryuji half the world—however, he desired everything.  
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Ryuji Vincenzo, a misunderstood son of a female gangster, beats his teacher upon seeing him commit a crime against his friend’s girlfriend. Yet because of his looks, the school forces him to change schools instead of expelling him. 

However, on his first day of changing schools, his class gets summoned to another world. 

He gains a useful class, but the calamity star chooses him. The star signals future tragedy or conflict in the new world. Despite this, the king, although asking them to fight against the demon king, doesn’t threaten them and is quite likeable.

Thankfully, the students are all given the power to fight, and this new life looks up for Ryuji, who desires to make friends and find himself a girlfriend.

Ryuji himself is quite a handsome man because of his father, but his mother's strict rules make him a strange person who wants to connect with people. 

This leads him to help those who cannot fight who would die otherwise. He wields a massive axe and uses his talents to support the weak members of his class. 
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BATTLE JUNKIE PROTAGONIST
LEVEL SYSTEM
WEAK -> STRONG
HAREM
BEAST GIRLS
DEMI GIRLS
MONSTER GIRLS
MOB GIRLS
NO YURI 
NO NTR
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This novel is a repost, as I became ill when writing the previous version and fell behind too much.

Extra Harem: S-Rank Berserker in Another World

While the excitement and adrenaline of the fight started fading, Ryuji's body began screaming in pain and agony. The constant usage of his class trait and the ability to temporarily ignore pain and duress backfiring.

"Yumiko, go help them find the treasure, okay?" Ryuji squeezed out his voice, trying to sound as normal as possible.

"Nn, are you sure?" Yumiko tilted her head, looking at his body; though it seemed to convulse slightly, he didn't visibly show any pain, so she accepted it when he nodded in response.

Ryuji watched Yumiko skipping towards the castle, finally losing the battle against the backlash from abusing his body and class.

His muscles began to cramp, tighten and twist visibly under his skin while Ryuji himself fell to the ground, leaning against a half-destroyed stone pillar, desperately trying to endure the feeling of his current suffering.

An Apostle of Light's Twisted Nature!