Oh hell yeah, one of my favorite web novels (Novelupdates) is here, the author created this before creating
"I'm the Evil Lord of an Intergalactic Empire!" and "Trapped in a Dating Sim: The World of Otome Games Is Tough for Mobs", but "Seventh" is the best work compared to them in terms of diversity of characters, character development, and overall plot despite the two having better world building and cocky main characters.
Seventh follows the basic structure of "Hero's Journey", which is why the main focus of the story is all about the MC's growth, not only in combat strength but also in politics.
It's also a Harem and it's big, like 10+ girls, but most of them have good characterization and development, they are very relevant in the combat scenes and political arena
But the real message of this story isn't the Hero's Journey, it's "anti-war profiteering" or "anti-war profiteers" which will happen in the later chapters of the story