Miss Universe Japan 2015, the 18th edition of Miss Universe Japan pageant, was held on March 12’ 2015, in Chinzanso Hotel, Tokyo. A total of forty-four contestants were shortlisted from all over Japan to compete at the finals. Ariana Miyamoto from Nagasaki was crowned as the winner, and represented Japan at the Miss Universe 2015 pageant.
The contestants (in alphabetical order were) - Ai Higashide, Airi Yukawa, Akane Takase, Akari Orita, Ariana Miyamoto, Ayaka Ishikubo, Ayaka Yamaoka, Chiemi Yamazaki, Emiko Kanou, Eri Natori, Erika Koyama, Haruka Takeyama, Hikaru Tsuchiya, Kei Iwamoto, Manami Takano, Mao Kaneko, Marie Izumi, Mayuko Fujiwara, Minori Miyakuchi, Miyu Tanaka, Nami Shimada, Remi Nagamoto, Rika Watanabe, Rikako Maebayashi, Rina Hirata, Rina Inoko, Risa Shimokawara, Risa Shoji, Risako Omura, Ryouko Watanabe, Saki Ichinose, Sakiko Tomita, Saya Honno, Serina Shibayama, Shiori Nara, Shizuka Komori, Suzuyo Okamoto, Tamao Tada, Tomoka Takeda, Wakaba Suda, Yoko Nishino, Yuka Morikawa, Yukari Yumen, and Yuki Morita.

The forty-four contestants battled out at the finals in the Preliminary Competition including, Evening Gown and Swimsuit Rounds. 

Keiko Tsuji, who won Miss Japan 2014 in Tokyo on March 18’ 2014 crowned Ariana as the winner. Keiko represented Japan at the Miss Universe 2014 international pageant, but could not make it to the Top finalists' list.