Former AKB48 member Nakanishi Rina is facing a lawsuit from her ex-employer following her decision to move into the AV industry.

The Japanese star, now under new pseudonym Yamaguchi Riko, has just released a nude photo book Departure and is set to release an adult video soon.

Although her contract with AKB48’s agency has ended in late 2008, there’s a clause stating that the lady must not become involved in any activities that could harm the pop group’s image and reputation. And the agency has deemed that the nude photo book has breached their terms.

The Tokyo district court however has ruled in the artist’s favour, that the photo book would do no significant harm to AKB48’s image. It is rumoured that the agency might continue to pursue the matter though.

AKB48 is currrently Japan’s top female pop group. Their previous single album Ponytail to Shushu has sold over 500,000 copies within a week.

As a side note, the pop group will hold a concert in Singapore in November, their first full gig in the Southeast Asia region.