"CALL TO ADVENTURE!: Defeating Dungeons with a Skill Board" centers on a young protagonist named Haruto, who finds himself transported to a fantasy world governed by game-like mechanics. In this world, adventurers navigate dungeons, battle monsters, and grow stronger using a unique system called the Skill Board, which allows individuals to allocate points to various abilities and skills. Haruto, initially an ordinary high school student, must quickly adapt to this new reality to survive.

The narrative begins with Haruto awakening in a mysterious dungeon, where he encounters a guide who explains the rules of the Skill Board system. Unlike others, Haruto discovers he has a rare ability to reset and reallocate his skill points at will, granting him unparalleled flexibility in combat and strategy. This ability becomes crucial as he forms a party with other adventurers, each with their own strengths and motivations. Together, they tackle increasingly dangerous dungeons, uncovering secrets about the world and the origins of the Skill Board.

Key characters include Rina, a skilled swordswoman with a tragic past; Leo, a mage who struggles with self-doubt; and Aria, a healer with a mysterious connection to the dungeons. As the group progresses, they face not only physical challenges but also moral dilemmas, such as the ethics of power accumulation and the consequences of their actions on the world. The story explores themes of teamwork, personal growth, and the balance between power and responsibility, all while maintaining a focus on strategic dungeon-crawling and character development. The plot is driven by both external conflicts, such as rival adventurers and powerful dungeon bosses, and internal struggles, as each character confronts their own fears and aspirations.