[KineJapan] LITTLE ADVENTURES 1978?

[quentin turnour]

Just checking with the Kine Japan collective to see if anyone here would be able to confirm the original title of a c.1978 Japanese live action children's film, sometimes titled in English LITTLE ADVENTURES. 
I have the following English information about the feature, but not a studio. I also cannot find any reference to the film in English language dbs (although imdb can be a thicket) or the Japanese sources I can access, such as JFDB. 
I think it's possibly this: https://www.nikkatsu.com/movie/25621.html. But the literal translation of the title is so different, and director Okamoto's career seems largely as an assistant on pinko eiga, not per the synopsis.
"Synopsis: A story of a group of school children on a bicycle trip from Tokyo to the Sea of Japan and their adventure en route.
" Director: Mr. Koji Okamoto

" Leading Actress: Miss Emi Kushida

" Leading Actor: Mr. Hidekauzu Takei
" Supporting…   Miss Midori Takei… Mr Makota Okamoto
Thanks in advance.
Quentin Turnour, National Archives of Australia.
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