Yoshirou, a secluded teenager, brings back home a stray cat after a car accident. The next morning the cat has turned into a nice girl, Kiki, who wants to be his girlfriend... Will catnip get in the way of their love?

Amagane Rinne has a fatal accident while hurrying to her first day of school. She suddenly arrives at an awkward school... in Hell, filled with demons. While she struggles and wishes to go back to the world from whence she came, Rinne befriends her demon schoolmates and develops an uncommon bond.

Zephyr, now known as Z, rides the seas with only one goal: Destroy all pirates and their dreams at becoming King of Pirates. When Luffy and his crew encounter him at sea, not only are they utterly defeated by the man with an arm made of Seastone, Nami, Robin, and Chopper are turned 10 years younger due to Z's minion Ain. Luffy is so determined to win against him that he does not even notice Z's master plan that could sacrifice thousands of lives.

Based on the visual novel by Overdrive. The what-if story reunites the Second Literature Club Band members Kirari, Chie, Shikanosuke, and Sarina, several months after the concert in the d2b vs Deardrops ~Cross the Future~ fan disk.