Tendo Blade

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.