Former Japanese Idol Momona Kozakura Makes AV Debut Under New Name Haruka Tachibana
The Japanese entertainer Momona Kozakura, a former member of the idol group momograci, has suddenly taken a very different career path. At 24, she has made her debut in the adult video (AV) industry under the stage name Haruka Tachibana.
Her debut was released on November 10, 2026, by IDEA POCKET as part of its First Impression series, which is known for introducing new actresses to the industry.
I came across four different websites covering this debut, along with plenty of online comments. Here’s what makes this story interesting: Momona didn’t come from a completely unknown group. While momograci was never one of Japan’s major mainstream idol acts, it had a respectable history in the independent idol scene and participated in the Tokyo Idol Festival for six consecutive years.
Who Is Momona Kozakura, the Former momograci Member?
Born in Aichi Prefecture, Momona Kozakura already had experience in the Japanese entertainment industry before making her debut as Haruka Tachibana.
She previously worked as a gravure idol, releasing three DVDs in that field before joining momograci. She was a member of the group during the first half of 2025.
Her career also included a brief stint with My Starry Diary in early 2026, where she performed under the stage name Reika Asakura.
In other words, this career change didn’t happen after just one idol experience. She had already explored several areas of Japanese entertainment and even worked under different stage names.
Was momograci a Famous Idol Group in Japan?
momograci was formed in 2016, originally under the name Momoiro Kakumei, and produced by idol Mai Kotone. In April 2021, the group adopted the name momograci.
It never reached the same level of popularity as major Japanese idol groups like AKB48 and Nogizaka46. However, it managed to build a respectable presence in the independent idol scene.
And here’s an interesting achievement: the group participated in the TOKYO IDOL FESTIVAL (TIF) for six consecutive years, including the period when it was still known as Momoiro Kakumei.
For those unfamiliar with it, TIF is considered one of Japan’s biggest idol festivals, bringing together hundreds of performers and groups. One edition of the event even attracted nearly 90,000 visitors.
momograci also held international activities, including performances in Taiwan and Thailand.
So, we’re not talking about a completely unknown group, but calling it one of Japan’s major music celebrities would be an exaggeration.
Momona Was Already a Gravure Model Before Becoming an Idol
Another interesting detail is that Momona had already worked as a gravure model before joining the group.
In fact, she used the name Reika Asakura and released three gravure DVDs, including My Sweet Princess.
In December 2024, it was announced that she would leave her former agency and adopt the name Momona Kozakura, joining momograci’s new lineup in January 2025.
At the time, she also expressed interest in participating in the Tokyo Idol Festival, which eventually became part of the group’s history.
This means her career in Japanese entertainment had several stages before her adult industry debut: gravure modeling, idol activities, and later a brief appearance with My Starry Diary.
IDEA POCKET’s Debut Campaign Leans on Her Former Idol Image
The image below is from her AV debut, right?
Now performing under the name Haruka Tachibana, she made her debut with the well-known producer IDEA POCKET, releasing FIRST IMPRESSION 197 (IDPC-032).
The production runs approximately 154 minutes and uses her previous idol career as one of its main promotional selling points.
As expected, her debut also attracted attention on Japanese forums, where users began discussing Momona Kozakura’s changed appearance and new artistic identity.
Some of the reactions included:
Some users said they would have difficulty recognizing the former idol in her new promotional photos.
Others questioned whether her current appearance was the result of cosmetic procedures.
There was also discussion about the physical characteristics mentioned in her promotional material.
Some commenters compared her appearance to other IDEA POCKET actresses.
Anyway, another IDOL making the jump to the AV industry…