Miku's tour has gotten so big that she needed her own plane! This livery is slightly different from her other A320neo as it boasts custom "Miku" tail lettering, and it also has a shiny gloss exterior! Enjoy!
As a footnote, if your Tail Numbers appear on the fuselage and you find that distracting from the experience, you can remove your Tail Number by going to World Map > ATC Options > Tail Number > and leave that field blank.
(No, I don't know how to speak Japanese, but my daughter somewhat does ;)