- Main article: テンドーブレード: Gameplay
Like The Genius of Sappheiros, the gameplay is roughly similar to the SaGa series, with テンドーブレード based on a less orthodox leveling up method. The player can have up to five character in the party and freely change the formation of the characters.
A UFO appears in the heavens and kidnaps Iku Nagae. Tenshi gets help from other characters to track down the UFO that kidnapped Iku. After inquiring everyone else in Gensokyo, with the help of Yukari Yakumo, Tenshi warps to a Sea of Clouds, where she confronts Nue Houjuu, who is responsible for the kidnapping.