Seiji Matsuoka

'''Seiji Matsuoka (松岡 星児) is a student of Higashi High School and an acquaintance of Kaoru Nishimi and Sentarou Kawabuchi.

Etymology

 * The name Seiji means "star" (星) (sei) and "child, infant, kid, young of animals, tot" (児) (ji).
 * Seiji's surname Matsuoka means "pine tree, fir tree" (松) (matsu) and "ridge, hill" (岡) (oka).