"Historical kana usage", a prescriptive method of using kana to write Japanese. Devised in the Edo period by Keichū (契沖) and taught in schools until 1946, it aims to be etymologically faithful and reflects earlier stages of the language (Heian period and earlier).

revisionism

(Japanese mythology) the first of the sons of 天照 (Amaterasu) (along with 天穂日 (Ama no Hohi), 天津彦根 (Amatsuhikone), 活津彦根 (Ikutsuhikone) and 熊野櫲樟日 (Kumanokusuhi)) who were given birth by 素戔嗚 (Susa no O) by chewing her jewels during the 誓約 (ukei, “oath”) to test his intent seeking refuge in her heavenly domain (the five sons were hers; the three daughters she gave birth to were his); he was sent by his mother to rule the land of 葦原の中つ国 (Ashihara no Nakatsukuni), but ultimately he recommended his son 瓊瓊杵 (Ninigi) instead

a male given name

(idiomatic) out of the blue, bolt from the blue, great surprise

一部: part / 一分: one minute; a few

服: (archaic) mourning; mourning clothes

無人: lack of help

土笛: ocarina

武道: budo, Japanese martial arts / 武術: martial arts / 武術: wushu, Chinese martial arts