Yuuka Asami (朝見優香), previously known as Makiko Tsujimoto (辻本牧子), born December 6, 1975, in Osaka, Japan, was the sixth actress to play Michiru Kaiou/Sailor Neptune in the Sailor Moon musicals. Her first performance was in 1999's Kaguya Shima Densetsu Kaiteiban, and her last show was Starlights - Ryuusei Densetsu in 2003 (although her last show as Sailor Neptune was Mugen Gakuen - Mistress Labyrinth in 2002). After graduating from her role as Michiru, Yuuka returned as a guest during the 2002 Autumn Fan Kansha, performing two musical numbers.
Yuuka was the longest running Neptune, with more then twice the number of stages as Hiroko Tahara, and the tenth longest running Myu performer. She was just one stage behind the ninth longest Myu performer, Sanae Kimura, the first Sailor Uranus. She was also the oldest Neptune, graduating at the age of 26.
Since graduating from the musicals, Yuuka has also kept in close contact with former co-star Nao Takagi. The two have hosted joint fan events together.
 Personal Trivia
- Yuuka is 5'3" tall and is blood type A.
- Her favorite jewel is ruby and her favorite colors are pink, green, and yellow.
- Kaguya Shima Densetsu (Kaiteiban) Natsuyasumi! Houseki Tankentai
- Shin / Henshin - Super Senshi e no Michi - Last Dracul Jokyoku
- Kessen / Transylvania no Mori - Shin Toujou! Chibi Moon wo Mamoru Senshi-tachi
- Kessen / Transylvania no Mori (Kaiteiban) - Saikyou no Kataki Dark Cain no Nazo
- Last Dracul Saishuu Shou - Chou Wakusei Death Vulcan no Fuuin
- Tanjou! Ankoku no Princess Black Lady
- Tanjou! Ankoku no Princess Black Lady (Kaiteiban) - Wakusei Nemesis no Nazo
- 10th Anniversary Festival - Ai no Sanctuary
- Mugen Gakuen - Mistress Labyrinth
Yuuka performed as Jadeite in the following musical:
- During the Fan Kansha for Mugen Gakuen, in response to a question asked of her, Yuuka said that she was not afraid of a battle as long as Sailor Uranus was there with her. Nao Takagi said that she (Nao) was afraid of "Kappa," which was Yuuka's nickname at that time.
- During the 2000 Fan Kansha for the Transylvania no Mori kaiteiban, Yuuka was paired with Eri Kanda to sing "You're My Jewelry." Eri pretended that she had a picnic blanket and laid it out for Yuuka, while Yuuka sat down and Eri put her head onto her lap. Yuuka then pretended that there was a fly buzzing around them and "accidentally" slapped Eri in the face while trying to hit it.
- Yuuka sang "Just Love Wasurerarenai" in her final Fan Kansha, Mugen Gakuen (Kaiteiban).
- During the Fan Kansha for the Ankoku no Princess Black Lady kaiteiban, the Outer Senshi sang "Tekichi wa Ginga TV Kyoku!" with Sailor Jupiter and Sailor Mars. Nao Takagi, who was narrating the entire Fan Kansha with Yuuka and Marina Kuroki, commented that "Kappa" looked sexy when posing with Yuuko Hosaka. There was laughter from the others in response to that comment, and Yuuka told Nao to be quiet.