Child Emperor vs. Phoenix Man

Child Emperor vs. Phoenix Man is the battle between the S-class hero Child Emperor and the Demon-level monster Phoenix Man

Prologue
Child Emperor is seen traversing through the Monster Association headquarters. Then, a monster with a cleaver appears behind him, but before he can attack, he is shot and killed by the Mini Octotank No. 8, a device created by Child Emperor that detects carbon dioxide levels in the area. Then, Child Emperor enters a room, where a broken robot is seen on an operating table. The hero quickly realizes that it is Bofoi's sentry robot, taken aback that the monster Bofoi spoke of was strong enough to cause such extensive and remarks that he wouldn't want to run into such a powerful monster. Child Emperor decides to download the data inside the robot's processor to obtain full schematics of the headquarters that might say where the hostage is, as well as any dialogue between monsters that might yield vital information. As he is downloading said information, he notices the arrangement of parts on the operating table, confirming that there was an unsuccessful attempt at recreating the machine. He also notes that most of the parts on the table have been perfectly reconstructed, and wonders if there were experts in robotics working for the Monster Association. The data is finished downloading, and the hero is relieved to see the precise location of the hostage. At the same time, he feels infuriated that Bofoi had such extensive knowledge and refused to help. However, he knows there was no use getting worked up, and leaves the room to retrieve the hostage.

Battle
As Child Emperor leaves the room, he takes out a large lollipop to relieve the built-up stress, but when he looks up, he sees Phoenix Man in front of him, his Mini Octotank No. 8 broken underneath the monster's feet. Phoenix Man mocks Child Emperor and the childish design of his machine, sarcastically asking him if he thought he came here to play. He continues by saying that he envied Child Emperor's youth and carefree life, but that he would nonetheless not hold anything back. Child Emperor chews his lollipop into shards and asks him if he was a simple cadre, to which Phoenix Man replies by saying he was more like middle management and he was ranked higher than most around him. Phoenix Man goes on a rant by saying how the Hero Association is marred with politics and that Child Emperor was only S-class because he was "slightly smarter" than average, also remarking that the hero shouldn't take the praises of adults seriously. He continues by stating the Monster Association was merely a stepping stone for him, and that eventually, he would take the title of "Monster King" from Orochi. Shifting his tone to a yelling voice, he arrogantly says his name and explains that he was once a human who wore a bird costume but couldn't take it off, and eventually he fused with the costume, officially becoming a monster. Phoenix Man proclaims that this is where he'd die, yet he would give him an instant, painless death, saying it was the least he could do, and strikes with his Beak Attack. Alas, the monster's attack is blocked by an invisible wall. Child Emperor reveals that while he was monologuing, he set up an invisible wall with film that was extremely resistant against the force of sudden impact. According to him, it could even be rolled into a tube or used as a candy wrapper, yet it was still in testing phase. He continues by explaining that he was originally going to capture him alive and have him lead the way, but since he's in a bad mood, he'd kill him right then and there. Suddenly, an array of very sharp and lethal weaponry shoots out from Child Emperor's backpack and strikes Phoenix Man at speeds he can't dodge or defend. In an instant, he is torn apart by this weaponry and drops down dead. As Child Emperor stands over his corpse, he remarks that it's good to have ambitions, but someone truly remarkable wouldn't have joined the Monster Association, yet he considers that this would also apply to himself. With that, he notes that his fight with Phoenix Man managed to cool him down a bit and he turns around, making his way towards Waganma.