I inherited the sponge

Born into the prestigious House of Shinsei, thirteen-year-old Kaito was destined for divine glory. His family loved him, his younger brother idolized him, and his lineage expected him to inherit a legendary path—the Dragon race or the legendary Class of the Sword God.But when he touched the divine Altar of Baptism, the system didn't roar with holy fire. It let out a pathetic, gray glitch.[Name: Kaito Shinsei][Race: Half-Human / Half-Sponge][Destiny Allocation: None][Active Skills: None]Humiliated before the entire kingdom and targeted by corrupt elites to protect his family's noble standing, Kaito was betrayed and cast deep into a locked, bottomless SSS-rank Hell Gate to be erased from existence.But the Goddess made a fatal miscalculation.Trapped in the dark for three brutal years, Kaito’s normal-looking human body survived the ultimate near-death conditioning to unlock an unlisted, primordial biological law: Absolute Sponge Absorption. He doesn't just block magic—his smooth skin acts like a cosmic black hole, vacuuming up, filtering, and permanently learning the exact identity of any spell that touches him.Now, at age 16, he has stepped out of the SSS dungeon completely unarmed, carrying a fully mastered arsenal of elite monster-slaying martial arts and 600 unique, copied cataclysm spells from ancient boss calamities.The catch? Kaito is completely dense. He genuinely thinks his god-tier cosmic siphon is just a basic household cleaning utility for dusting cave walls.While the surface heroes celebrate the fall of the Demon Lord, an unstoppable, weaponless master janitor in level-1 beginner rags has just walked out of the abyss. And the universe's magic system is about to be completely wrung dry.