Sanbika (and its follower Sanbika 21) are the most popular Protestant hymnals in Japan. My edition of Seika was published in 1986, where "Mikami no ai wo ba" is numbered 85. It is the official hymnal of Nihon Fukuin Renmei ("Evangelical Associaltion of Japan" composed of several denominations). My corrections are:

Mikami no ai wo ba
utou warera no
mune wa hirakitari
hana no gotoku ni
mikao no hikari ni
mayoi no kiri mo
utagai no kumo mo
kiete ato nashi

~Masato