Memories, both good and bad, suffuse the high school experience. Whether it's hanging out with friends or cramming for tests, everyone has something they will remember from that time in their lives. At a certain high school, one class is faced with an event that can cause people to look back on their high school days in sadness: the death of a student. The deceased is not just any student—she's Tomie Kawakami, a popular girl with an almost otherworldly beauty. Her death was particularly gruesome: her body was dismembered and the pieces scattered. As the class tries to make sense of the situation, they are shocked when a familiar voice calls out to them from the doorway, apologizing for being late. With raven hair and a beauty mark under her left eye, this girl is the spitting image of their murdered classmate. But she can't actually be Tomie, right?

Kanenone Gakuen is an all-male boarding school located in the countryside of Japan. Although an all-male school is nothing new, life can become quite difficult when there are no female students for miles around. In order to help the psychological health of everyone involved, the school board has decided to try and merge with the nearest all-girl boarding school in order to become co-ed. The boys of Kanenone are more than thrilled at the prospect, and the girls are curious as to how interesting school life might become if there were more boys around. Before any serious decisions are made, the girls have been invited to stay at Kanenone for one month as a test. Green Green follows Yuusuke Takazaki and his naughty room mates called the Baka (Idiot) Trio, and their ability to talk to the girls without making complete fools of themselves. But as soon as the school bus with the girls arrives, things become weird, hormonal, and hysterical. In particular, a girl named Midori Chitose leaps off the bus and immediately embraces a very confused Yuusuke. Is he a natural ladies' man, or do the two of them have a shared history that he is not aware of?

On his first day of junior high, Eren Yeager comes face-to-face with a titan—and has his lunch stolen! From that day on, he holds a grudge against titans for taking his favorite food from him, a cheeseburger, vowing to eliminate their kind once and for all. Along with his adoptive sister Mikasa Ackerman and their friend Armin Arlert, the trio traverse the halls of Titan Junior High, encountering familiar faces and participating in various extracurricular activities as part of the Wall Cleanup Club. A parody of the immensely popular parent series, Shingeki! Kyojin Chuugakkou places beloved characters as junior high school students, fighting to protect their lunches from gluttonous titans.