Tsukishima Marina (月島 まりな) is the in-game navigation character. She is a staff at the Live House CiRCLE. In the game's Main Story, she is trying to get five bands together for a multi-live event together with the Player Character's help.
Marina has black hair with her fringe neatly sorted to her right. with a bob cut all the way to her shoulder. She has fair skin and somewhat pink-red eyes. Her outfit consists of low-cut jeans with a white-blue horizontal lines shirt with a black cardigan.
Tsukishima (月島): Tsuki (月) means "moon", while Shima (島) means "island." It is also a special ward in Chuuou, Tokyo.
Marina (まりな) has no meaning on its own.
- She seldom appears in event stories, card stories and the second and third band stories after the first few chapters of the main story.
- Her height appears to match Saaya's, Rinko's, Nanami's, Ran's, and Misaki's, at 157 cm tall.
- She is the only major adult character in the game as other adult characters, like Ran's Father, Yukina's Father, and Kokoro's bodyguards are all but supporting characters only.
- Marina is also the only major adult character who is voiced.
- In FUN! FUN! CiRCLING FIVESTAR!, Marina reveals that she used to play in a five-member band as a guitarist. Their band aimed to be the best, trying to go pro and wanted scouts to recognize their talent, however the band lost the passion eventually when they didn't reach the level they wanted and started losing their audience. According to Marina, they also realized they weren't having any fun playing.
- She also keeps her guitar at the backstage of CiRCLE and sometimes plays it.
- In Hopeful Session, Maya coincidentally buys a CD player from a market and finds an untitled CD inside it, which ends up being a song created by Marina's band just after they broke up. They titled it HOPE, recorded it on a CD, and then handed it out to all of their friends and fans. She sometimes hums it while working, saying that she has fun memories of the song-creating process, and how it was the first time their band had been having fun together in a while.
- Marina enjoys reading manga.
- Marina dislikes horror and scary things.
- Comic 006: 1st Girls Band Election!
- Comic 023: Girls Band Collaboration Cafe!
- Comic 073: To The Future
- Comic 136: The Ideal Adult
- Comic 150: With Keen Interest
- Comic 216: Only at CiRCLE
- Comic 255: CiRCLE Check!
- Comic 272: Hard Work Pays Off!
- Comic 276: Return to Rocking Star
- Comic 310: 楽しいお仕事
- Comic 311: これからも