The supporting character's harem is very normal - Chapter 483: My name is… Arine

Sein was only a child when he was abducted from the surface world and forced to join the Black Magic Academy. In the Underworld, strength reigns supreme and the weak struggles to survive. As the death toll of magic initiates continues to rise within the walls of the academy, Sein’s quest for knowledge and power is a constant battle for survival.

Memories of his parents and the starry night sky in the surface world are fading with each passing day in the Underworld.

“Is Magus World the name of the world we live in? Where is my home in the Magus World?” These are the burning questions that Sein has in mind.

Will he be able to rise to the pinnacle of power, discover the truth of the world and ultimately find his way back home?

Official blurb:

He hails from the banished land of the Underworld, bound by a single unforgiving rule—survival of the fittest. He is the seeker of truth, a mage who treads the fine line between sanity and madness. In a world where myths have crumbled and chaos holds sway, it is strength that reigns supreme.

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Before going to college, an ordinary high school student went to celebrate and got drunk. When he woke up, he found himself in a completely different world. There was a big sect, the approaching sect entrance examination, a slum where his body’s previous owner lived, and a shared memory about a missing young girl.

When he got tangled in a fight with a few punks in this different world, he fell off a cliff and miraculously found himself still alive, with two more voices ringing inside his head. They were Sword Master and Saber Master. In the company of them, he continued to find out more about this whole new world. He took the sect entrance examination, entered the sect, met a strange man in black, and even participated in a major competition of the sect to have a chance to win over his peers!
In this whole new world, he was born again and got to explore the fantastic martial world!

- Description from Novelupdates

Song Zhong’s parents were the geniuses of the sect. But they were apparently killed while on a mission when he was barely 6. As he apparently did not excel in any of the 5 elements, in fact, all 5 elements are in balance in his body. Thus, our fatty is deemed to be trash and does not deserve the respect his parents had.

He is allowed to have one task, to collect garbage of the sect until he reaches the initial test-age where he has to prove that he is worthy to stay in the sect.

Our fatty has no choice but to cultivate the only heritage his parents gave him. A mysterious black pearl.

Unfortunately for him, this pearl seems to be only useful for… collecting garbage…

- Description from Novelupdates

In this story, a regular guy from our world becomes a young Main Branch heir of the powerful Hyuga clan in the Naruto world.He's primarily interested in gaining more power and doesn't care about right or wrong. He uses his knowledge from Earth and the Naruto show to get ahead, using his creativity and intellect to the utmost.As he tries to become more powerful, we see sides of the Hyuga clan and ninja world that weren't shown in the original Naruto story.He looks into the secrets of his ancestors, the Hyuga's eyes, and how ninja politics work, finding out things we never knew before and that the original author left unexplored.However, gradually, along the way, he also meets new lovers, friends, subordinates, and enemies and challenges how things are done in the ninja world - and also tries to unify it in the process and bring real peace around.