Well, "Joyful, joyful, we adore Thee" may not be in Sambika, but I just found it in Seika (Showa 33 edition, i.e. 1958, I think), another Japanese hymnal, where the first verse goes, in transliteration,

Mikami no ai wo ba
utou warera no
mune wa hira kitari
hana no gotoku ni
mikao no hikari ni
mayoi no kiri mo
uta kai no kumo mo
kiete ato nashi

(not at all sure about the word breaks).

I also find this hymnal has a Japanese version (6 stanzas) of "Come, O Thou Traveler unknown", incipit "Yofukenokawabeni", which it sets to what the American Methodists call CANDLER but which it correctly names YE BANKS AND BRAES (of bonnie Doon).

Perhaps Masato or someone can tell me what the essential difference is between Seika (which I have only seen used by Lutherans here in Seattle) and Sambika which is used by all the other Japanese Protestant congregations I know of here, and was the hymnal used in the churches I attended in Japan as a kid.

Liland aka Haruo