My Japanese is a little rusty but I think "One Off" might also be the Mfr. as well as the description.
Looks like these guys do some auto prototyping.
Also found a diffuser and vented fender that might be theirs. Here is the contact info I found
One-off parts and sales | one-off club Onuma Works
One-off club | production and sale of one-off parts
Onuma Works Co., Ltd.
〒 270-2241
Matsudo, Chiba Prefecture Matsudoshinden 129-1 [Access]
TEL :047-362-7111 FAX :047-367-6559
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