Park Hyung Seok is an unpopular, bullied high-school student who is looked down on by his fellow student for his obesity. Bullied and harassed every day by a delinquent, he takes out his anger verbally on his mother and asks for a school transfer. Resolving to run away from his problems and start anew, he moves to Seoul and plans to attend a new high school. A few nights before he begins school, however, he receives a new body that is tall, muscular, and handsome. When one body is in use, the other falls asleep; he can switch bodies by waking up the sleeping one. His days are split between the two bodies: the handsome one for the daytime, and the original for the night. As Daniel Park (Park Hyung Seok) lives with two bodies, he begins to see how much the world discriminates against people considered unattractive or different. He experiences discrimination and hates for his original body, kindness, and special treatment of others. His new body makes him a social-media influencer, a trainee for an entertainment company, and a clothing model. At night, however, Daniel's dream life becomes a harsh reality when he returns to his original body.

Tanjirou and his comrades embark on a new mission within the Yoshiwara Entertainment District to face the demon Daki.

The first episode is a summary of SM, SM R and SM S, the second episode is about Haruka and Michiru on a cruise ship. They fight one of the SuperS enemies and decide to leave this villain to the classical Sailor Team. (That's an explanation why the outer Sailor Team doesn't appear in this season.) In episode 3 Chibiusa uncovers one of her classmates as a monster and fights her with the Sailor Team in a vampire castle.

"The Shepherd," an urban legend of Shiomi Academy, is said to appear before hardworking students to grant them a wish. While engrossed in a book inside the school's renowned Great Library, Kyoutarou Kakei, a second year student and the Library Club's de facto president, receives an email from the Shepherd foretelling an event that will change his fate. Worried by the message, Kyoutarou rushes over to a nearby train station and encounters fellow student Tsugumi Shirasaki, whom he saves from being hit by a derailing train. Grateful for his heroic actions, Tsugumi joins the Library Club and invites Kyoutarou to participate in her mysterious "Shiomi Happy Project." Together with other new members of the club, they strive to make the academy a better place and uncover the identity of the enigmatic Shepherd. [Written by MAL Rewrite]