HA-gyou Tenko-on
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" to Hatsuon shita kana-Moji desu. Mata, Azuchi-Momoyama Jidai ni wa "fa, fe, fi, fo, fu" datta koto ga Kirisuto-kyou no Bunken de Kakunin sarete i-masu. Soshite, Gotou (Tango no atama) de wa, mada "f" no mama desu ga, Gochuu (Tango no Tochuu) de wa, "wa, we, wi, wo, u" to Hatsuon sarete i-masu. Sarani Edo Jidai ni naru to Gotou de wa "ha, he, hi, ho, fu", Gochuu de wa "wa, e, i, o, u" to nari-masu.
Korera no Henka wo Daihyou-teki na Jidai-Kubun, Kofun[*2], Heian[*3], Edo[*4] wo mochiite, Seiri shi-masu.
| Gotou | [HA] | [HE] | [HI] | [HO] | [HU] |
|---|---|---|---|---|---|
| Kofun | pa | pe | pi | po | pu |
| Heian | fa | fe | fi | fo | fu |
| Edo | ha | he | hi | ho | fu |
| Gochuu | [HA] | [HE] | [HI] | [HO] | [HU] |
| Kofun | pa | pe | pi | po | pu |
| Heian | fa | fe | fi | fo | fu |
| ↓ | wa | we | wi | wo | u |
| Edo | wa | e | i | o | u |
Toku ni "pu" kara "fu" wo hete "u" e no Henka wa Eikyou-ryoku ga tsuyoku, "au", "eu", "iu" to iu 2juu-Boin no yomi wo ookiku kaeru koto ni nari-mashita.
