Riisa Naka is a Japanese actress and voice actor born on October 18, 1989, in Nagasaki Prefecture, Japan. She is affiliated with the Japanese talent agency Amuse, which marked the beginning of her career in entertainment after she was discovered in 2004 through a modeling contest for the manga magazine Ciao. Her entry into the industry led to work as a model for the teen fashion magazine CANDy before she transitioned into acting.

Naka's debut as a voice actor came in 2006 with the critically acclaimed animated film The Girl Who Leapt Through Time. She provided the voice for the film's main protagonist, Makoto Konno, a role that brought her significant recognition early in her career. The film, directed by Mamoru Hosoda, is based on the classic 1965 novel by Yasutaka Tsutsui. Her performance in this film is a cornerstone of her voice acting filmography.

Beyond her debut, Naka has taken on other notable roles in animation. She voiced the character Yumi Jinnouchi in another acclaimed Hosoda film, Summer Wars, in 2009. Her filmography also includes the role of Ageha in the 2021 film Crayon Shin-chan: Shrouded in Mystery! The Flowers of Tenkazu Academy and the character Emily in the 2023 film The Imaginary. Most recently, she voiced an NK Cell in the 2024 live-action film adaptation of the popular anime and manga series Cells at Work!.

Naka's career is distinguished by her versatility as a performer, moving fluidly between live-action television dramas, films, and voice acting. Her work has been recognized with several awards. In 2008, she won the Best Newcomer Award at the Yokohama Film Festival for her role in the film Jun Kissa Isobe. The following year, in 2010, she received the Japan Academy Prize for Best Newcomer, a prestigious honor, for her dual roles in the films Zebraman 2: Attack on Zebra City and the live-action adaptation of Time Traveller: The Girl Who Leapt Through Time. Later, in 2017, she won the Tokyo Drama Award for Best Supporting Actress for her performance in the television drama Anata no Koto wa Sorehodo.

Regarding the specific request for information on the role of Suisen in Eiga Oshiri Tantei Saraba Itoshiki Aibō (Oshiri) yo, no information was found in the search results provided to confirm this role.