Zen Kamioka

Zen Kamioka (上岡 善) is a man who just joined Arata Kaizaki's former company who visits Michiru Saiki's grave from time to time.

Etymology

 * The name Zen means "good" (善).
 * Zen's surname Kamioka means "above, top, upper" (上) (kami) and "ridge, hill" (岡) (oka).
 * Kamioka is an homage to the Kamioka Station in Ōita, Japan.