Unofficial Competition: Truthful but Misleading

[robkelk]

A powerful group creates a walled city to train their children to gain abilities. They hope produce a human who can reach Level 6. But the protagonist accidentally builds a powerful harem along the way, and even uncovers a nefarious plot to distribute a way to temporarily increase a level.

Spoiler

Is it Wrong to Pick up Girls in a Dungeon?

Am I doing this right, guys?

You forgot to mention that the anime version has Nobuhiko Okamoto play the annoying, snide, white-haired, Level 5 secondary character, but, yeah, you're doing this right.