Mutant who is the ultimate project of the Gekko organisation.

It’s love at first sight for Fudo and Desumi, except it was during a battle of life and death. Fudo, leader of the hero squad Gelato 5, and Desumi, the Death Queen of the evil society Gekko, have found themselves caught in a forbidden love—and it’s their first relationship! Moving in secrecy, they live holding hands with one weapon in the other, finding out what’s truly fair in love and war.
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(Source: Crunchyroll)

There are two sides to every coin...light vs. dark, good vs. evil, love vs. hate. Sometimes the line between the two grows thin...and it's so, so easy to cross. So it's no surprise that Fudo Aikawa, A.K.A. Red Gelato of the Gelato Five and hero to all people, just may have happened to fall for the villainess and member of the shadow organization Gekko, Desumi Magahara! But when opposites like these attract, there's more than a few obstacles to their love...! What's a pair like this to do?
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(Source: Kodansha USA)

Ultimate Phantom