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

Ryuji's eyes flashed with amusement, seeing Lich's change. He stepped back, waiting for them to finish while looking back at the party. Sheila looked at him with a fearful look, but to Ryuji, she just looked even more adorable.

The strange power she showed earlier triggered something inside him. It made him want to crush her, tear out her insides.

Though he didn't know why he felt that way, the mere shimmer of her divine magic seemed to make him want to push her down and... 'Forget it, let's enjoy this battle.' He thought to himself, seeing Yumiko, Paul, and Erika were now safe and out of the monster's range.

"You foolish dog, hiding within that human physique and thinking you can defeat me! A pure-blooded demon!"

The Lich's body transformed completely. Ryuji felt it resembled the scene in novels where the main character takes a random body-tempering pill and suddenly gains an eight-pack of abs and super-strong muscles.

Berserk vs Steroids!