|Nickname||Marina (マリーナ), Tenrai-chan (天来ちゃん)|
|Birthdate||February 14, 2004|
|Current Age||16 Years Old|
|Agency||Setouchi Co. Ltd.|
|Idol Career Info|
|Team||STU48 1st Generation|
|Debuted||March, 2017 / 1st Generation|
- Joined Actors School Hiroshima (ASH) as a member of the 27th generation.
- On December 17th, was selected to be one of MAX♡GIRLS's (Actors School Hiroshima idol unit) new members.
- On March 19th, passed the auditions for STU48's 1st Generation.
- On March 30th, during ASH 2017 SPRING ACT, it was announced she will stop her activities as a member of SPL∞ASH and graduated from ASH.
- On March 31st, joined STU48.
AKB48 Senbatsu Elections
- Daisuki na Hito
- Mubou na Yume wa Sameru Koto ga Nai
- Omoidaseru Koi wo Shiyou
- Hitorigoto de Kataru Kurainara
- STU48 (Kurayami)
- Hi Zenryoku (Kurayami)
- Shukko (Kaze wo Matsu)
- Genten (Kaze wo Matsu) (Center)
- Which is which? (Daisuki na Hito)
- Kiseki no Iu Na no Story (Mubou na Yume wa Sameru Koto ga Nai)
- Sunglasses Days (Hitorigoto de Kataru Kurainara)
- STU1 (GO!GO! little SEABIRDS!!)
- Megumi no Hito
- Showroom Audition Number: #10
- Favorite Members: Tanaka Miku, Habu Mizuho
- Admired Member: Yamamoto Sayaka
- Favorite Food: Saury, macaron
- Special Skills: Singing and dancing
- Hobbies: Singing, dancing, watching movies, manga, anime
- Former Actor School Hiroshima (ASH) student and a member of MAX♡GIRLS.
- Likes heavy metal
- Youngest of three
Otani Marina 10th Senbatsu Election Poster (2018)
Otani Marina (2018)
Otani Marina 9th Senbatsu Election Poster (2017)
Otani Marina (2017)
Otani Marina (April 2017)
Otani Marina before joining STU48
|STU48 1st Generation|
| Ishida Chiho | Ishida Minami | Imamura Mitsuki | Iwata Hina | Okada Nana | Otani Marina | Kai Kokoa | Kadowaki Miyuna | Sakaki Miyu |
Takino Yumiko | Tanaka Kouko | Taniguchi Mahina | Hyodo Aoi | Fukuda Akari | Mineyoshi Arisa | Morishita Maiha | Yano Honoka | Yabushita Fu