After the events of Star Wars: Episode IX - The Rise of Skywalker (2019), Poe Dameron and BB-8 must make an emergency landing on the volcanic planet Mustafar where they meet the greedy and conniving Graballa the Hutt. The crime boss has purchased Darth Vader's castle and is renovating it into the galaxy's first all-inclusive Sith-inspired luxury hotel. While waiting for his X-Wing to be repaired, Poe, BB-8, Graballa, and Dean (a plucky and courageous young boy who works as Graballa's mechanic) venture deep into the mysterious castle with Vader's loyal servant, Vaneé.
住在踯躅台的高中1年级生响裕太，某天醒来后失去了记忆。 之后，裕太与旧电脑里显现出来的“Hyper Agent·古立特”相遇了。 古立特告诉裕太“去完成使命”，而裕太则开始寻找这番话的意义以及自己的记忆。 虽然对这一突发事件感到困惑，裕太仍然在同班同学内海将以及宝多六花、新条茜等人的帮助下过着每一天。 然而，平稳的日常被突然现身的怪兽轻易地踏碎——。
