Hello, Nishikura-san,

As you may have gathered from the response you received so far,
"haafu" is not considered by many English speakers to be an acceptable
word to use when referring to children who have one Japanese and one
non-Japanese parent. In fact, along with "mixed-race," which you also
use in your post, many people find the word "haafu" pretty insulting.
(This may be more the case for the parents than for the kids
themselves, but there it is.)

Anyway, if you want your project to succeed, I suggest you be more
careful with the words you use to refer to people. Otherwise you run
the risk of alienating the very people you want to attract to your
project.

Best regards,
Scott Reynolds (father of a son who is a dual citizen (not a half-
citizen) and is fully bilingual (not half-lingual), unlike his dad who
is a citizen of only one country and has been described as only
partially literate)