Yuki Itose is just a typical student dealing with the pressures of college. She is struggling one day on the train when an upperclassman named Itsuomi Nagi helps her out. As he gradually opens a new world to her, Yuki develops feelings for Itsuomi. A pure love story begins to grow.

When the Agent of Spring, Hinagiku Kayo, is abducted, spring itself vanishes—plunging the world into unending winter. Refusing to give up, her devoted guard, Sakura Himedaka, searches for her for years. When Hinagiku suddenly returns, the two set out to restore the lost season, face the past that tore them apart, and reclaim the warmth they refuse to lose again.

Natsuki Haibara thought his high school years were a complete failure—until he suddenly wakes up as a freshman again, armed with all he learned in college. Determined to rewrite his school days, he joins the popular crowd, makes friends he never had, and grows closer to his crush. But second chances aren’t as easy as hitting “Restart.” Can Natsuki turn his regrets into a rainbow-colored youth?!

In the near future, civilization has collapsed. Gear works in a junk shop, retrieving stolen goods alongside Qu-0213 and White Bear. After accepting a mysterious request to steal an important item, they soon find themselves hunted by deadly assassins.