I'm a loner and I use cheats to adapt to the dungeon. Gaiden Collection

The provided text details the initial chapters of a light novel, introducing the protagonist, Kurosaki Naoto, a socially isolated high school sophomore. Naoto is physically imposing with a stern gaze, which contributes to his lack of friends, despite possessing good grades and athletic ability. He is fundamentally kind but can be ruthless towards enemies. His parents, Akane and Kyoya, are supportive, though Akane frequently teases him about his appearance.

Naoto's classmate, Shinomiya Yui, is a popular, kind, and academically gifted girl who is one of the few aware of Naoto's hidden good looks. Another classmate, Sakuma Keiichi, a self-proclaimed delinquent, harbors a crush on Yui and often tries to provoke Naoto, though he is intimidated by him. Shirakane Hayato, a charismatic and popular classmate, is Yui's childhood friend and secretly harbors feelings for her. He is an oblivious narcissist who looks down on others, a trait Naoto recognizes.

The narrative takes a sharp turn when a self-proclaimed "God," a handsome and flamboyant being, forcibly teleports Naoto and his classmates into a "Dungeon" filled with the world's negative emotions. This "God" created a tutorial fairy named Tear to guide Naoto. Tear, initially terrified of Naoto, quickly warms up to him and becomes his friend. Naoto also acquires a rare and loyal Carbuncle named Ruby as a subordinate, which possesses healing and barrier magic, as well as the ability to emit heat rays.

Within the Dungeon, Naoto encounters various monsters, starting with Goblins, Kobolds, Hobgoblins, and a Goblin Lord in the first layer. In the second layer, they face Forest Wolves, Poison Spiders, Paralysis Butterflies, Hide Wolves, Sleep Sheep, and a Kaiser Wolf as the layer boss. Naoto's unique skills, "Truth Eye" and "Usurper," are revealed.

The chapters also introduce other classmates who form parties within the Dungeon. Tanaka Sota, an otaku with latent talent, initially fights alongside others but is abandoned and killed by Mihama Rina. Yamda Soichiro, another otaku, attempts to force himself on Rina after Tanaka's death but is defeated by Naoto. Sato Yuya, a manipulative individual, orchestrates Rina's attack on Tanaka and attempts to kill Naoto, but is also defeated. Mihama Rina, a selfish and cruel "gyaru," is ultimately killed by Naoto for her actions. Hasegawa Aiko and Miyashita Yurina are introduced as studious classmates, while Minase Yukino, a cold and aloof student, shares Naoto's solitary status.

The initial chapters establish Naoto's isolation, his latent strength, and the sudden, dangerous shift in his reality as he is thrust into a life-or-death struggle within a magical Dungeon, forcing him to confront his own ruthlessness and develop a true will to survive.