Ritsuko Akizuki, Vivid Bikini, Idolmaster

The image shows Ritsuko Akizuki wearing a green bikini in a pool or waterpark setting. The woman has brown hair and is standing with her left hand on her hip, looking at the camera with a confident expression. She appears to be posing for a photo shoot, possibly as part of an advertisement or promotional material for the Vivid Bikini brand. The background of the image is blurred, but it appears to be a pool area with other people in the distance. Overall, the image conveys a sense of fun and relaxation, suggesting that the Vivid Bikini brand is associated with leisure activities and summer vibes.