"Various Corrupted Marinas in the bad end scenarios reach across time and space and encroach upon the couple who are living a happy life!"

Marina and Souma both went on to attend the same university and are enjoying their daily lives. One day, Marina experiences interference from another dimension. This disrupts the chain of causality, resulting in the appearance of many fallen Marinas from another dimensions. The only way to return them to normal is for Souma to satisfy the unfulfilled desires of the fallen Marinas.

"Marina vs. Fallen Marina" & "Souma vs. Fallen Marina" --
A battle that transcends dimensions begins now!

[From the official website]