The charming incarnations of the seven deadly sins—brothers Lucifer, Mammon, Leviathan, Satan, Asmodeus, Beelzebub, and Belphegor—can never seem to keep out of mischief. They are demons feared across the Devildom, but, at the Royal Academy of Diavolo, one human transfer student has captured their collective hearts. Whenever the brothers miss them, they engage in ridiculous antics to keep themselves entertained, and they even drag others into their neverending shenanigans.

Episode 0 of Free!: Dive to the Future was shown at a special Free! event. Episode 1 also pre-aired during this same event. Episode 0 will eventually be included in the BD/DVD release of Free!: Dive to the Future.

Freelance photographer Kouhei Morioka is traveling to a castle in Germany to take photos of paranormal activity for his friend Hiromi Anzai, editor of an occult magazine. Upon entering the castle, he's confronted by a young girl in a white dress and cat ears who calls herself Hazuki. She takes a keen interest in Kouhei and offers him a kiss, but she instead reveals herself to be a vampire, sucks his blood, and turns him into her slave. Much to Hazuki's dismay, however, Kouhei is unaffected by her bite. Hoping to escape the castle and her possessive butler Vigo, Hazuki instead forces Kouhei to help her. With the help of his powerful exorcist cousin Seiji Midou, the two make it out safely. Finally free, Hazuki flees to Japan in search of her mother. Not long after Kouhei returns home, he discovers Hazuki has nested in his home, where he reluctantly allows her to stay. Meanwhile, other vampires set out to find the missing Hazuki. Equal parts gothic and adorable, Tsukuyomi: Moonphase is a charming and mystical story where two unlikely allies form a unique bond in an attempt to defy a society of immortals. [Written by MAL Rewrite]

Nobita Nobi is an elementary student who hates studying, is bad at sports, and does everything half-heartedly. He is a pushover, unlucky, and fearful of many things. His personality makes him a failure in life, even affecting his progeny. This causes his great-great-grandchild, Sewashi, to take control of the situation. Sewashi travels back in time from the 22nd century to the 20th century to meet Nobita, who is shocked to see him appear out of his drawer alongside a blue robotic cat. The robotic cat calls himself Doraemon, who claims to have been pressured by Sewashi to assist Nobita, with their ultimate goal being to provide Nobita happiness. Frustrated after seeing Nobita's hopeless state, Doraemon decides to go back to the future. However, Sewashi activates a program within Doraemon that prevents him from doing so. Forced to stay, Doraemon helps Nobita using futuristic gadgets through his four-dimensional pocket—a bag containing anything inside it. Can Doraemon bring Nobita happiness and return to the future? [Written by MAL Rewrite]