After meeting one day, a shy boy who expresses himself through haiku and a bubbly but self-conscious girl share a brief, magical summer.

After failing his college entrance exams, 18 year-old Tsukasa Mizugaki is offered a position at the renowned SAI Corporation, known for its production and management of Giftia, androids that possess human emotions. Tsukasa’s position is in the terminal service department where the main job is to recover Giftias that are close to their expiration, a graveyard department in every sense. To make matters worse, Tsukasa is ordered to work with Isla, a female Giftia who is never given any responsibility other than serving tea to co-workers.

A girl named Mitsuki Kanzaki lives with her step-brother Yuya after her mother remarries. One day, Mitsuki is possessed by the self-proclaimed spirit of a young girl, Hiyori Kotobuki. Hiyori (in Mitsuki's body) must fall in love with Yuya to move towards the "Gates of Heaven."

A mecha otaku is reincarnated into another world as Ernesti Echevarria, also known as Eru. In this world, huge humanoid weapons known as Silhouette Knights exist. Dreaming of piloting those robots, Eru and his friends, Archid Olter and Adeltrud Olter, aim to become Knight Runners.

Gengo Matsunaga, once known as Phoenix, was the greatest samurai fire-slayer in all of Edo. After leaving fire-slaying, Gengo is approached with an offer from the Shinjo Domain. Encouraged by his wife, Miyuki, he sets out to rebuild a fallen firefighting brigade. Gengo gathers a group of misfits, the Ragged Fire-Slayers, as they investigate mysterious fires started by the arsonist Kitsunebi.

The crown of England has been hotly contested throughout history, and in the Middle Ages, a series of great civil wars became known as the War of the Roses. Claiming a right to the throne, the Duke of York seeks to unseat King Henry VI and his heir in order to become king himself.

Despised by his own mother, the third son of the House of York battles his inner demons as the War of the Roses rages across medieval England.