Plum

Plum was Kairo's creation in Chapter 6.

History
In Chapter 6, Plum was an ordinary underwear until Kairo magically brought him to life, with wings like a bird. In Chapter 18, a great friendship between Plum and Kairo had been created. When Kairo went to home, Tatsuya had discovered Plum and became furious. Kairo, believing the end, Plum jumped in front of her protecting him from Tatsuya. Plum deeply thanked Kairo for having been his friend and was destroyed by Tatsuya. In Chapter 19, Kairo held a funeral for Plum.