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arcadia_~rakuen_no_hana~ bra cleavage hahagi_yui mizuno_touko nanako_(arcadia_~rakuen_no_hana~) seifuku thighhighs wildrose yuri

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weighless girl is weightless.
Gretchen said:
weighless girl is weightless.
I think the characters are Hahagi Yui and Nanako from Arcadia ~Flowers of Paradise~.
Nanako (the weightless girl) is in a coma, and that's her 'ghost', which would explain why she is weightless.

Note that she has much longer hair here, and the uniforms are different as well, but the school still looks the same, so it's probably a few years after the story when Hahagi Yui is in high school.