Featuring "Treasure!" by Dialogue+ ( I Want to Escape from Princess Lessons Ed) and "Twinkle Days" by harmoe ( Fluffy Paradise Ed), respectively, creditless versions of Possibly the Greatest Alchemist of All Time 's opening and ending sequences are now available to watch below. Crunchyroll is simulcasting the fantasy series in a range of subs and dubs. Possibly the Greatest Alchemist of All Time Opening Video Possibly the Greatest Alchemist of All Time Ending Video Related: Bogus Skill <<Fruitmaster>> Anime Releases Creditless Opening, Ending Song Videos Based on the light novels by Kogitsunemaru, Naoyuki Kuzuya ( Reborn to Master the Blade: From Hero-King to Extraordinary Squire ) directs Possibly the Greatest Alchemist of All Time at Studio Comet, with series composition by Mitsutaka Hirota ( Helck ), character designs by Sayaka Anezaki and music by Hiroshi Nakamura ( Sweet Reincarnation ). Crunchyroll describes the story: Iruma Takumi finds himself caught up in a hero summoning, even though he’s not a hero.