[YMDD-055] The Last, Sister Co-star Work Of Uehara Sisters

she has one younger brother too

Was in the mood to remember how unreliable the internet can be.

Using my search bar, asked

why were sisters 上原亜衣 and 上原麻衣 so close

Got this:

Sisters Ai Uehara and Mai Uehara were very close because they shared a deep, supportive bond. As siblings, they maintained a warm relationship that culminated in the adult video industry. Mai ultimately agreed to make her debut and step into the industry solely to work alongside her younger sister, which famously resulted in their only collaborative project, 最初で最後の、上原姉妹 (First and Last, The Uehara Sisters).

Switched to a AI mode response. And got:

Ai Uehara (上原亜衣) and Mai Uehara (上原麻衣) were not actual, biological sisters. Instead, their . . . “sibling” relationship was an entirely fabricated marketing gimmick created by adult film production companies to promote their collaborative videos.

The Real Story . . .

Marketing Gimmick: In 2014, when Ai Uehara was one of the top AV actresses, a new actress was introduced under the stage name Mai Uehara. She was heavily marketed as Ai’s real-life older sister. . . . The studios utilized this narrative to build hype for . . . “sister-themed” dual films.

The JAVLibrary has them listed as

Uehara Ai (Harada Mai) (Akimoto Rin)

上原亜衣 (原田麻衣) (秋元凛)

Futaba Yuna (Uehara Mai)

双葉ゆな (上原麻衣)

After two image videos, Futaba Yuna debuted in the 2014-04-01

CND-094 ～初出演なのにエロテクが仕上がってる超美肌素人娘～麻●十番で働く歯科助手 AVデビュー 双葉ゆな

An amateur beauty with flawless skin—and surprisingly polished erotic skills despite her debut—Yuna Futaba, a dental assistant working in Azabu-Juban, makes her AV debut.

And then, ordinary meanings regarding order be d*mned, they appeared in this 2014-10-07

[YMDD-055] The Last, Sister Co-star Work Of Uehara Sisters

Before the release of the 2015-02-07

[ALD-809] Sisters’ first co-performance is a miracle!! . . .

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Now. Were they actually sisters. . . ?