Fudou and Desumi are having one of their usual mid-battle idyllic meetups when Fudou tells her he’s going to appear in a commercial…for a bridal venue…as a groom, cutting a cake with the lovely celebrity Hashimoto Anna as the bride. Desumi is understandably not okay with this, Fudou tells her it’s his job and she’s being selfish, and she runs off. Haru, always keeping watch over the couple, quickly gets Fudou to realize how badly he effed up.
While Desumi sulks over Fudou’s virtual cheating, Fudou tries to get Big Gelato to cancel the commercial gig, but the venue already provided funding to complete Gelato 5’s new combined weapon, so he instead gets to work baking a cake worthy of cutting with Desumi before he cuts one in the commercial with Hashi-An.
Unfortunately, when he calls Desumi to announce said cake is complete, she doesn’t answer, since she’s still down in the dumps. Then she and all the other Gekko members are assembled by Bosslar to behold the awakening of Ultimate Phantom, a megaboss with which he intends to take over the world.
Unfortunately, Ultimate Phantom doesn’t turn out quite like Bosslar expected. It’s a giant, ornery baby that cannot be controlled. All the Gekko members throw everything they have at it to no avail, and Culverin Bear even gets eaten and his powers absorbed by Phantom.
Desumi is still too distraught to care about all of this, but at the commercial shoot Fudou just can’t go through with cutting a wedding cake with another woman, and in any case Ultimate Phantom attacks the venue in order to defeat Red Gelato. Desumi catches the attack on the news.
Fudou is briefly distracted by the destruction of the cake he made for Desumi, but the other members of Gelato 5 assemble and fight Ultimate Phantom. But they’re no match for it either, and Gekko rolls in to try to bring it to heel. Desumi tags along, still unsure what to do until she sees the remains of Fudou’s cake.
Phantom eats the wedding cake meant for the shoot, transforming itself into a cake baby monster, which is actually a thing that exists and is the occasional mascot for the NBA’s New Orleans Pelicans. I also suspect the previous episode’s baby antics were setup for the reveal of this ludicrous final boss.
When all his comrades are out of commission, it’s up to Red Gelato to wield their new combined weapon, but he alone isn’t strong enough. That’s where Desumi comes in, the two quickly make up, and then combine forces to defeat Ultimate Phantom, an act that doubles as cutting a cake together.
Fully made up and back to their lovey-dovey selves, Desumi and Fudou are embarrassed to find that the baby-sized version of Ultimate Phantom that remains has seemingly imprinted on them as its mama and papa. The hero news covered this entire incident, but always remained too far away to hear what the two lovebirds were saying.
When they draw in close enough to try to get an interview, wondering if the aces of Gekko and Gelato are now allies, Desumi returns to her Reaper Princess persona and beats the stuffing out of Red Gelato, leaving no doubt as to whether there’s “mutual understanding”. Of course, Fudou tips his hat at Desumi’s efforts to keep their relationship theirs.
So ends a very bizarre but fun and entertaining finale to a show that always marched to the beat of its own drummer and exhibited both a solid knack for adorable romance and surpassing creativity with its hero/villain milieu. If it ever gets a sequel, I’ll definitely be tuning in.