Begone, Ultramarine: Fragile Light of Pistol StarBegone, Ultramarine - Fragile Light of Pistol Star -; Fragile Light of Pistol Star; Inakunare, Gunjou Fragile Light of Pistol Star; Потерянный ультрамарин - Хрупкий свет звезды Пистолет; いなくなれ、群青 Fragile Light of Pistol Star; 消失吧，群青 Fragile Light of Pistol Star; 階段島シリーズ; 사라져라, 군청 Fragile Light of Pistol Star

16-year-old Nanakusa is spending his mundane life on "Stairway Island" where he found himself "discarded" along with 2000 other people, all missing the memories of the time just before they arrived there. The name of the island originates from the long stairway running through the island and extending up to the summit of the mountain where the witch who rules the island is said to live. The only way to leave the island is by finding what was lost. Yet Nanakusa doesn't wish to leave this stagnant island. He enjoys his life there. That is until Manabe Yuu, his childhood friend appears in front of him, and turns his new life upside-down. Why did Manabe Yuu, the world's most optimistic person, get discarded, and who is the witch behind all these mysterious occurrences? Follow Nanakusa and Manabe as they uncover the true nature of Stairway Island.