Rekishi-teki-kanazukai de [HA][HE][HI][HO][HU] to tsuzuru kana-Moji wa, "wa, e, i, o, u" to yomu koto ga ari-masu. Korera no yomi wo HA-gyou Tenko-on[*1] to yobi-masu. [HA][HE][HI][HO][HU] wa, Heian Jidai yori mae wa "pa, pe, pi, po, pu" …