Dentro serves as the elderly caretaker of an orphanage in Centvelt village, raising protagonist Ten and the main group of young Farmagia: Leii, Arche, Chica, Emero, and Anzar. He mentors them, imparting knowledge about farming monsters and guiding their development. Ten is one of his pupils. His teachings and orphanage provided sanctuary, saving countless lives in Felicidad.

His background reveals he is a seraph who, alongside archangels Diluculum and Eleonora, co-created Felicidad and its denizens after a failed rebellion against God. This history positions him as a foundational figure in the underworld's existence. The orphans under his care, including Ten's group, were later revealed as Advanced Replicants—beings created by Diluculum with enhanced Farmagia potential, making Dentro their indirect creator despite their familial bonds.

During the conflict against Glaza's tyranny and later Diluculum's resurgence, Dentro supported Nares' rebellion as part of Avrion's leadership. His role expanded beyond mentorship to strategic involvement in Felicidad's liberation. In the final confrontation, he deliberately allowed Diluculum to absorb his soul during the Grand Harvest Festival. This sacrifice exploited the divine curse embedded in his being—a slowed version of the rapid aging that killed Eleonora—critically weakening Diluculum and enabling Ten to defeat him.

His death contributed to restoring Felicidad and reversing the Grand Harvest Festival's effects. While his physical presence concluded, his legacy endured through Ten and the orphanage group, who became Felicidad's new rulers. His soul entered a cycle of reincarnation alongside other deceased characters, implying spiritual continuation.