Isshin

To survive, the unfortunate Gong Qiying, who became the lord of the Sein Dungeon, had to make his dungeon extremely "hellish": Doors that "cannot be opened from this side", treasure chests "triggering teleport traps", a three hundred and sixty-five mile journey from the starting point to the BOSS room with no place to rest, monster knights with great bows on either side of a narrow bridge, and sinister ambushes around corners. There's also unavoidable visits to poisonous pits and hidden paths... Additionally, well-known fighters like Isshin Ashina, the Furnace Knight, Rajang, and the Scourge Legion bring unexpected surprises! Various unique rewards such as the Flaming Sword, Murky Hand Scythe, Rapid Slash Longsword, Sacred Oath, and Flame Empowerment will make you too happy to contain your joy! Gong Qiying: The most important thing in my dungeon is to ensure adventurers have fun!

The devil has eyes in many places, however they all focus on one person at the moment, his name is Isshin Kurosai. Isshin is a teenager who a few months ago left a small town to live in one of the biggest cities in the world, Tokyo, however things seem to get worse and worse. Always lost in his own mind, Isshin always had really bad concentration, something that always affected his school life, always performing very poorly in almost all subjects. His parents, concerned about their son's future, send him to Tokyo to be accompanied by a famous therapist who says she can help the boy, at the same time that he enters a new school, specialized in "problem" students of all kinds. Following his therapist's advice, one day he decides to go talk to a girl who seems to have been following him for sometime, little does he know that the world that he has always lived is so small compared to what he will discover. Too much power is not just a gift, it can also become a curse.