Professor Decorisky is a brilliant scientist entrusted with assembling the KiraDeco 5, a team dedicated to retrieving the scattered Deco Stones and averting the catastrophic spread of Eternal Darkness across the human world. She steers the group with strategic guidance via communication systems, leveraging her vast expertise in the realms of both humanity and Jewel Land. Her dialogue distinctively ends with the suffix “~Deco,” a trademark tied to her mission’s identity.

Her history intertwines with the Dark General, leader of the rival Decoranain forces, as former romantic partners—a dynamic that intensifies their clashes as she strives to dismantle his schemes. She shares a familial bond with Pink Oomiya, her cousin and a key member of the KiraDeco 5, anchoring her personal stakes in the team’s success.

During the climactic finale, her true essence is unveiled: she embodies the living soul of Jewelina, the petrified deity who originally forged the Jewelpets. Merging with Jewelina’s statue, she transcends into Decorina, a singular fusion reigniting the goddess’s vitality. This transformation not only resurrects Jewelina but also catalyzes the resolution of the overarching crisis, securing the reconstructed Mirror Ball and halting the encroaching darkness.