Kiyui

"Kiyui"

- The day after tomorrow is my birthday.

Kiyui is a young boy who lives at the orphanage with Riko and the other orphans. He is often seen with Nat and Shiggy.

Appearance
Kiyui's exact age is unknown, but he has the appearance of a toddler or preschooler. Kiyui has blue, often half-closed eyes and short blond hair with a single curl on his forehead. He wears the standard white shirt and baggy pants of the orphanage. He also wears a bell around his neck to signify his role as a Bell Whistle Delver.

Personality
Kiyui is a friendly and good natured child. Due to being very young, the other orphans are usually seen looking after him.

Orth Arc
Kiyui is present right at the beginning of the story and later seen as he reads a book about the Abyss.

After Riko brought back Reg to the orphanage, he observes as the others inspect Reg and try to wake him up with an electrical shock, which causes a blackout. Leader catches him and the others, upon inspecting the blackout's source, and he is punished.

After Reg successfully manages to officially join the orphanage, he and Kiyui often spend time together while the others go cave raiding.

When Riko and Nat start arguing because she has made up her mind to leave Orth for good, Kiyui starts crying and Reg comforts him.

Before departing with Riko into the Abyss, Reg warns Kiyui not to look into the mirror on his birthday, fearing he may get Birthday-Death Disease. Kiyui does end up getting sick, but when Mio takes him to her ship to treat him, he seems to make an instant recovery.

Delver Apprentice
Kiyui has theoretical knowledge about the Abyss, but has not made his first dive into it yet, presumably because he is too young.

Trivia

 * He is the only known survivor of the Birthday-Death Disease known so far.
 * Kiyui seems to have formed a bond with Reg in the time they knew each other before Reg and Riko's descent into the Abyss. In fact, before Reg left, he visited Kiyui in his bed to say goodbye before sunrise.
 * According to Akihito Tsukushi, Kiyui has a scent of dried saliva.