Series 1, technically called UTAUpss: Series1, Close Companions.
Which includes Ishimaru Michiyo and Sakuwatari Chiyo, who are a considered a 'set'. (Much like the Kagamine twins, although unlike Rin and Len, Michiyo and Chiyo are not siblings/ related in anyway.)
Pages in category "Series 1"
The following 5 pages are in this category, out of 5 total.
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