Later, the group stays in a living room. Hijiri is depressed about the whole incident. Tsuzuki suggests another surgery to remove the donated cornea, but Watari replies that it won't work because the cornea is now a part of Hijiri's body. To cheer up Hijiri, Tsuzuki promises to protect the boy, and prompts Hisoka to agree with him. However, Hisoka refuses because he doesn't want to make invalid promises. Hisoka warns Tsuzuki he will be the one to suffer if he fails.

Hisoka leaves the room and meets Tatsumi in the hallway. Tatsumi wants to know how he's adjusting to the shinigami work. Hisoka replies he is not very sure yet. Hisoka is also learning spells from Konoe because a shinigami who cannot use spells is useless and he wants to be on the same level as Tsuzuki. However, he feels Tsuzuki is too kind for the job and makes promises he may not be able to keep. Tatsumi reassures Hisoka that Tsuzuki is only like that on the surface, and he always keep his promises. Tatsumi also believes the two of them will work well together.

Meanwhile, Hijiri refuses to stay at Enma Cho for protection, no matter how Tsuzuki and the others try to convince him otherwise. Tsuzuki finally gives in, but vows to keep Hijiri safe.

In the next couple of days, Hijiri faces all kinds of danger. First, the basketball stand at school falls and almost flattens him. Then, an empty car almost crushes into him. Tsuzuki saves him on both occasions. The third time, the hill on the side of the road collapses and would have swallowed him alive if not for both Tsuzuki and Hisoka. Hijiri notices Tsuzuki's right hand is injured, but Tsuzuki says it's okay because he's a shinigami and the wound heals instantly. {Tsuzuki: "If you die, Kazusa dies as well."} Tsuzuki finally agrees to their protection.

In Enma Cho, Watari is frustrated because he can't identify the demon's true form. The GuShoShin brothers, however, notice something is unusual.
{GuShoShin-elder: "But you still look cheerful. Could it be that you're glad you've meet a worthy competitor?
Watari: "You can tell?"
::both GuShoShin brothers nods::
Watari: "Heh, this is a challenge for me. I won't lose!"
GuShoShin brothers: -_-;}

Tsuzuki, Hisoka, and Hijiri go to see Kazusa. Tsuzuki suggests bringing Kazusa to Enma Cho for her safety. When Kazusa first sees Tsuzuki, she calls him "ojisan." [Ojisan means "uncle" or "middle-aged man." XDD] Tsuzuki spends majority of the time sulking in the back, poking at a stuffed toy. Kazusa tells Hijiri she isn't afraid of him, and the reason she hid from him before is because there was something scary behind him at the time. Tsuzuki and Hisoka note this and believes what Kazusa saw may be significant in this case.

Later that night, Hijiri and Tsuzuki are back in Hijiri's place. Hisoka has taken Kazusa to Enma Cho, so Hijiri doesn't need to worry about her. Tsuzuki makes some curry rice and wants Hijiri to try it out. Needless to say, Hijiri almost throws up due to Tsuzuki's horrible cooking skills. Tsuzuki, totally oblivious but having great confidence in his own cooking, thinks Hijiri is speechless because of the delicious taste. {Hijiri: "He sure lives up to the shinigami title. Even his sense of taste is dead."} After Tsuzuki leaves the room to finish the curry, Hijiri starts to play the violin. The black dog from before growls and suddenly Hijiri feels pain in his left eye again. The wind blows the window open and a demon appears before him. The demon promises to teach Hijiri all the songs he know. By the time Tsuzuki notices something is wrong, he finds the room empty.

Hijiri goes to the school clinic and finds a hidden violin. When Tsuzuki finally finds him, Hijiri is playing the violin in a frenzy, his left eye glowing in the dark.

Watari is still trying to figure out the identity of the demon. Kazusa is sitting on a chair nearby and holding her teddy bear, with the owl 003 perching behind her. She comes up to Watari and points at the computer screen, saying she has seen the image before. The image in question is that of a creature in the shape of a dog. Watari realizes the dog is one of the demon's true forms. Just then, Tsuzuki enters the room and takes in the current situation.

Hijiri takes Kazusa to the school's auditorium, so he can fulfill his promise to play the violin for her. As he starts to play, the demon comes out of his shadows and tries to attack him. However, a barrier blocks the demon's attack. The performance is actually a trap to force the demon out. Tsuzuki shows up to fight the demon, who transforms into a bigger monster. He is then identified as the Fire Dragon Brigade Leader Surgatanus.

The demon begins to attack all of them. His power is so strong that soon the building is in ruins. Tsuzuki summons Byakko, a shikigami in the form of a great white tiger. Byakko spits out an energy bomb at the demon, injuring him. In revenge, the demon bombards flames at Watari and company.

The flames bounce off the protective barrier surrounding them. As Watari observes the air battle, he finds it impressive that Tsuzuki has enough power to fight such a powerful demon. Just then, the demon looks over at Hijiri and causes Hijiri to bend over in pain. When Hijiri looks up again, he sees the demon heading for Tsuzuki. Hijiri runs out of the barrier and into the open field. Surprised, Watari and the others shout out his name. Tsuzuki gets distracted by the commotion and looks their way. The demon uses this chance to slam into him, biting him on the shoulder. Tsuzuki manages to escape by calling Byakko, who blows the demon away.

When Tsuzuki lands on the ground, the group rushes over to his side. Watari immediately strips Tsuzuki, yelling, "let me see your body!" The rest of the group are shocked. While Hisoka and Hijiri blush silently, the two GuShoShin brothers try to cover Kazusa's eyes and ask what the heck Watari is doing. Finally done, Watari breathes a sigh of relief and says it's all good. {Tsuzuki: "Watari... Is this the way you see me?" Watari: "Shut up, you idiot! The demon may have invaded your body!"} Watari then explains how the demon has a strong vitality and may not be so easily killed. The demon also does not have a solid form and is a sort of parasite that needs a host to survive. Hijiri is concerned about Tsuzuki's injuries, but Tsuzuki tells him not to worry about it.

However, when Tsuzuki returns to the school clinic, blood explodes out of his shoulder. {Tsuzuki: "You *are* still alive!" Surgatanus: "Of course. I won't be killed so easily. My power will not disappear!"} The demon then begins to take over Tsuzuki's body by invading his body cells one by one. The blood disappears into the shoulder wound and forms a black X mark. {Sargatanis: "You're now part of me."} Black wings spout out of Tsuzuki's back. When Tsuzuki speaks again, it is in the demon's voice: "This is now my true form."