Episode three opens with Yui receiving a love letter from a cute girl. Falling for a not unattractive young lad who saved you from being drained by an escaped vampire prisoner is not an unreasonable thing for this girl to do, but as strong and brave as he is, she still doesn’t know him, and he’s too busy with his quest for vengeance to notice or deal with romance.
While this girl sees him as a hero, Shinoa continues to look down at him as a novice, as well as a frustrated virgin. She points out the Demon Army isn’t just about killing vamps, but also creating an environment suitable for human procreation. The virus killed 9/10ths of them, after all, so the remaining tenth “needs to make babies”, to quote Commander Adama.
Shinoa doesn’t doubt Yui’s physical strength or his courage, but warns him he shouldn’t move to fast with his training. Only those with cursed gear can fight vampires, and the demons within them will consume, rather than contract with, those with “weak hearts.” Shinoa believes Yui’s unyielding thirst for vengeance makes his heart weak. Not a bad conclusion, but incomplete, as we see.
When one of their classmates wanders into a forbidden dungeon below the school, where demons roam ready to take the souls of the weak, Yui, Shinoa and Yoichi head down there. Shiona reveals it’s really a training ground for the VEU, and the whole school is a human experiment for recruiting VEU members, who are naturally drawn to said dungeon.
So while there are bullies and love letters and cut euniforms, the school isn’t just a regular school after all. Shinoa even mocks Yui for potentially thinking “such a peaceful place” as the school appears on the surfact could ever exist in such a messed up world.
If Shinoa was hoping to intimidate Yui with all this show-and-tell, she failed, and if she didn’t want him to do anything rash, she shouldn’t have let him in the dungeon at all. Then again, when Yui goes through the forbidden door, she doesn’t stop him, suggesting she’s letting him make his own choices. Once there she insists he not touch he demon gear his classmate is holding, lest he become consumed by a demon. Again, Yui ignores her warnings and grabs the ax with a nifty little move.
Then all of a sudden he’s gone back in time with Mika and his family. Shinoa didn’t say how the demon would consume him, but creating a very real illusion of his past is a good way to start. But where both Shinoa and the demon underestimate Yui is in not in their calculation of his desire for revenge—which is high—but the fact such a desire is a weakness.
Yui knows his desire is wrong, so it can’t hurt him as badly. He also knows it’s something Mika wouldn’t want, so as soon as Mika and the other kids are acting totally out of character, Yui knows he’s in an illusion and breaks free.Doing so impresses Shinoa once again, who again seems put out that he proved her wrong yet again.
Yui’s heart isn’t as weak as she thought, but will see what happens if and when he learns Mikaela not only wasn’t killed, but became the very thing Yui wants to wipe off the face of the earth. We finally get a good look at Vampire Mika, who doesn’t seem particularly friendly with Ferid. More likely, he’s done what he’s done all this time to survive. He always put others before himself, so I’d like to think a few years of being a vampire hasn’t bleached out that inherent goodness.