Haruka meets a group of clerics in the fantastical frontier of Omui. One of the clerics, Arianna, is actually the princess of the Theocracy. She explains the Theocracy's deep corruption, and Haruka resolves to protect her from an upcoming political purge. First, he'll send her party someplace safe--a dungeon?! Thus begins a revolutionary power-leveling training regime: the clerics are bound to get stronger than any pursuing assassins! And when Arianna is concerned about her homeland suffering under the new papal reign, Haruka has a plan in store for that too...

When sarcastic loner Haruka gets transported with his class to another world, he's not wild about adventuring, but he wouldn't mind having some cool powers. Unfortunately, he's last in line when the magic cheat skills get divvied up, so by the time it's Haruka's turn, there are no good choices left. Now Haruka will have to take on this fantasy world the hard way--on his own, with a hodgepodge of bizarre skills! When infighting and chaos break out among his classmates, can this loner come to the rescue?

SAFE, SECURE, AND ON CLOUD NINE! FOR NOW... With the false dungeon finally complete, Haruka and his motley crew have bought Omui some much-needed safety! But for how long, exactly, will peace on the frontier last? Word from Narogy brings our stalwart loner heading even further into the unknown, scouting out a not-too-distant kingdom and its royal family. Just what kind of new threats will he uncover on his wayward mission? Does the mighty kingdom wish to expand its borders past Narogy and take Omui for itself? Will Haruka's fake labyrinth be enough to keep the fearsome Royal Guard at bay? And just how many mechanisms and traps can you line a dungeon with before it's considered a war crime?

The frontier has been saved from Nallogi's advances, but Haruka's problems aren't over yet! As Haruka and his classmates delve deep into the dungeons around Omui, they encounter an invincible dungeon king, strong enough to rival Angelica herself. Meanwhile, the kingdom moves against the frontier, led by a mysterious member of the royal family. Are Haruka's cheat skills enough to escape unscathed, or is this the end for the fantasy world loner?

FIRING ON ALL FOUR CYLINDERS! Haruka reluctantly saves the day again and again, but now he wants nothing more than to go home to his cave and enjoy his loner life! But fate has grander designs in store for the hapless young lad. Word of an ancient, loot-laden dungeon rolls in, and the tantalizing allure of treasures unknown is too much for him to resist! Into the depths our loner hero goes, but he may well meet his match in the form of a being far more lonesome than he... The Dungeon Emperor!

The shut-in Yuki Sakurai had received the first love letter of his life. This could certainly be called a miracle and for it to occur, it seemed he had used up all luck he had. Just shortly after reading the letter, he and his little sister Katsumi find themselves stuck inside a dungeon cell. Apparently their house had merged with a throne room of another world and the king was not amused for some reason. Genres of this light novel series include isekai, fantasy, romance, comedy, harem, game, action, ecchi, magic, school and demons.

Loner Haruka and his classmates set out for the Beast Kingdom as envoys for Diorelle amid the Theocracy-induced political turmoil. Their mission? Win the Beast Kingdom's support! But the beastfolk revere strength above all else and seem to distain the low-level Haruka. If that isn't bad enough, the strongest members of the tribe challenge Haruka to a duel!