Rainbow Days
Rainbow Days is a manga series.
Also recorded as Nijiiro Days.
In detail
The recorded language is Japanese.
It is associated with Japan. The recorded subject matter is high school student.
Sources
Each source is named with the standing the house places on it, so the evidence can be weighed rather than taken on trust.
reference work · Reputable secondary · Wikipedia
“Rainbow Days”, English Wikipedia, consulted as further reading
Consult the sourcereference work · Reputable secondary · Wikidata
Wikidata, structured authority record Q18086520: Rainbow Days
Consult the source