Utarou has just been told that he has a short amount of time left to live. As he's letting the news sink in, a girl named Tsukimi shows up by his window and offers to grant him any wish he has. What will he wish for and how will it turn out for him?
Tsukimi Planet contains examples of:
- Aliens Are Bastards: If you pick The World's Demise option, Tsukimi will root for your decision.
- Downer Ending: All of them. The True End is the saddest one of them all.
- I Lied: The True End reveals that Tsukimi lied about being able to give Utarou more time to live. Chances are that she was trying to cheer him up, which seemed to work.
- Lighter and Softer: Downer Ending aside, at least this game doesnt involve a Yandere attempting to a life from another or even threatening the hero choose her instead.
- Meaningful Name: "Tsuki" means "moon" and Utarou believes that Tsukimi is from the moon.
- Multiple Endings: Two Bad Ends and one True End.
- Shout-Out: The entire story can be considered one to the story of Princess Kaguya; Ending 2 even lampshades this by simple storytelling.
- Stalker with a Crush: It turns out in the True End that Tsukimi was this to Utarou. Unlike Charon's other games, Tsukimi is relatively harmless.
- Supernatural Gold Eyes: Tsukimi has these. Subverted as she's not magical.
- Together in Death: In the True End, Tsukimi commits suicide in order to be with Utarou in death.
- Your Days Are Numbered: The game is about Utarou only having a short amount of time left to live.