Klasbas P9, was a humanoid Mechanical Monster in the original Mazinger Anime and was featured close to the conclusion of the Mazinger-Photon Power Lab/Underground Empire War, just before the final battle. He had bat wings, as well booster thrusts under his feet for flight, and a helmet for a head with 2 small horns and was Purple and Red in color. He featured a massive Cone like weapon which serve as a powerful Vacuum Cleaner that sucked anything with in his path.

As the end nears, both sides prepare for the final battle, Dr Hell and Count Brocken over see work on the latest Mechanical Beast – Klasbas P9 . Dr. Hell has his concerns as the Beast is not sufficiently powerful to provide enough time for his forces for the final battle. At that moment an Iron Mask soldier arrives to provide him with an important piece of information.

As these preparations are underway, Shiro suffers from an emotional crisis remembering his decease mother, who died many years prior working with his father in an experiment. Sayaka and Boss attempt to help him out only for their actions exacerbate the problem – Sayaka helping out by buying too much toys leaving her broke and berating Shiro for it, and Boss wearing a Kimono and Make up to play the role of mother for him, which really, REALLY, does not help. Koji reprimands Shiro for the bratty behavior shown, telling him to forget her. Shiro runs off, with his behavior only going from bad to worst when he proceed to attack beach goers, in the end getting mud fling by the other children: to be honest, the little shit did kinda asked for it.

As he meditates, Shiro is called by name by woman, to his shock, having a great resembles to his late mother, which she identifies as such. She then takes Shiro to her home, where she explain to him she survived the blast. Shiro asks if he can bring Koji, hoping to reunite the entire family, but refuses out of the fact her sons accepted war rather than the path of peace their father died for, Shiro promises he'll convince Koji to change and her mother, while proud of Shiro's words, she knew Koji won't be so forthcoming and convinces Shiro to plant a bomb on the Jet Pilder, threatening he'll not be allowed to see her again.

By the next day, Klasbas is launched and detected, the lab going on a state of alert, Shiro arrives on the Pilder hangar before Koji, sets and implants the time bomb and stops Koji from boarding the Pilder, taking him out before the Bomb goes off. Koji infuriated demanded an explanation, to which Shiro tells he did this at the request of his mother, Prof. Yumi told Koji to go out and investigate the woman, in the maintain, the lab worked on rebuilding the Pilder, while Diana and Borot fought Klasbas in the middle of the city with the beast repelling their attacks and Borot getting stuck on its vacuum arm, but the two struggle to stopped the Beast's march onto the power lab and are both taken out of commission.

Koji and Shiro arrived at their mother's house, Koji surprise and shock in seeing her for himself. She takes the gun off of his hand and throws it out of the yard, but Koji grabs her demanding an explanation for her actions and her survival – silently, she put her hands over his shoulders only to use her nail to stab him to the point of bleeding, Koji smacks her, but she then stands up and shows another bomb in hand. Koji rapidly kicks it off of her hand and the bomb goes off in the yard, Iron Mask Soldiers come out of hiding and attack, but Koji is capable to fending them off, Shiro runs outside to grab the gun, but the woman tries to convince him to give her the gun, but after been lied and used, in his distraught state, Shiro opens fire at her and fluid comes out from her abdomen and falls to the ground. Shiro runs towards the woman, but Koji grab him in time and moves him away from her before she exploded, revealing to have been an Android all the time.

As Koji runs back to the lab, the Beast arrives and attacks, Boss and Sayaka wake up and run to catch up. Koji flies the Pilder and connects with Mazinger and proceed to fight, but the Beast takes the upper hand, at that moment Diana A and Boss Borot arrive – Sayaka takes the chance to fire her Scarlet Beam, Borot then grabs onto the beast, but he takes off with Borot holding to his arm. Not allowing it to escape, Koji fire his rocket punch, finding its mark, blowing up Klasbas P9 and Borot along with it. Despite this loss, Hell understood his monster fulfilled his mission, allowing enough time for the preparation for the final battle.

The episode ends with Shiro proving his own eulogy talk to his mother, Koji, along with the gang arrive on bikes, advises him to say her mother's name out loud, to which Shiro does and shouts her name to the Sunset sky.