Upon regaining her senses, Yui Furukawa discovers that the current day is July 13—a starting point that she has never experienced prior. However, despite the unfamiliar circumstances, she resolves to spend her summer vacation with the other members of the Astronomy Club at Nagisa Hanamiya's family villa. The house and its surrounding area have a rich history; a renowned scientist, Nagisa's great-grandmother researched and developed technology at the nearby military manufacturing plant. While the Astronomy Club is having fun at the beach, a sudden storm stops their plans short. Left with no other choice, the group takes shelter at the abandoned factory, eventually leading them to explore a hidden underground bunker. What they encounter there may reveal an unprecedented connection to a lost future.

Kouyou Kotesashi, possesses exceptional massage skills and dreams of becoming a sports doctor. To secure a scholarship to medical school, he enrolls at Seiwa University Affiliated High School, a powerhouse in athletics. Coming from a poor family, Kouyou takes up a live-in job at the school's dormitory to cover his expenses. However, he soon finds himself surrounded by a group of highly talented yet quirky female athletes. His role? Managing the dorm while also tending to their physical and mental well-being. With a mix of intense training, close-quarters dorm life, and massage therapy, an unpredictable and daring new chapter begins! (Source: MAL News)

Tetsuya Wakatsuki, a young photographer, documents an alien invasion that brutally annihilates the human population. When a few mishaps lead to him being pushed up against the enemy commander, Tetsuya is knocked unconscious. Much to his surprise, he wakes up on a spaceship where the alien commander, Princess Kahm of Saint Evascuraze, reveals that she has taken a liking to him. Now she wants him to become her husband! Though hesitant to accept the proposal at first, Tetsuya soon realizes that a marriage to Kahm could potentially save the rest of humanity from certain doom. For the sake of stopping the invasion, he decides to marry the alien princess—even if doing so goes against the wishes of her father, the emperor.

Short anime series of Sin: Nanatsu no Taizai.