A four-year-old boy that tends to cling to Mika and cries when he has to leave.
For the short time he appeared, Junji is shown to be an innocent, sensitive, and tearful little boy who loved his family orphanage, as he was very adamant about not leaving. He enjoys picture books, particularly old fantasy adventures, and has a fear of ghosts. Junji is said to be so kind, that despite being abused and neglected by his old parents, he held no grudge against them.
At some point in his life, he was picked up by the Brotherhood of a Thousand Nights, a religious organization infamous for cruel experimentation on orphans, and was experimented on as part of the Seraph of the End project.
Junji is told he is getting adopted, so he cries and clings to Mika. Eventually, Mika is able to soothe him, and he tells Miyuki Yamada (Mahiru Hiragi) how to take care of Junji. In reality, she is only taking him to use as a test subject.
As soon as they leave, Mahiru murders a man sitting in a blue sedan and knocks out Junji before leaving. They are attacked by vampires en route, and she protects Junji.
When she mentions Krul Tepes, the vampires take both her and the boy with them.
- "But Mika, I don’t want to. I don’t wanna go!"—To Mikaela, Chapter 2
- "I don’t want a new big sister! I… I… I wanna stay with you two! You’re my brother and sister!"—To Mikaela and Akane, Chapter 2
- "That’s what you said, Mika! You said I’m not alone anymore! That everyone at the orphanage is my family!"—To Mikaela, Chapter 2
- "Okay. If it will make you proud… then I’ll do my best."—To Mikaela, Chapter 2
- "Ah….wh….what…"—After Miyuki Yamada (Mahiru Hiragi) adopts him and promptly murders an innocent bystander right in front of him, Chapter 2