Day/Night cycle.
Addition of 3 areas to visit during the day (Beach, Pool, Leisure Area).
Ability to let either Satoshi or Kendo hang out with Mary.
Addition of 1 Mary scene at the beach (+ short version of scene).
Addition of 1 Mary scene at the pool (+ short version of scene).
Addition of 1 Mary and Erina scene at Leisure Area (3 variations).
Addition of 1 area to visit during the nighttime (hotsprings).
Ability to let either Satoshi or Kendo hang out with Mary at the hotsprings.
Addition of 2 abridged h-scenes between Mary and Satoshi during nighttime (seen prior in the intro).