Ever since they started dating, Risa finds herself falling harder and harder for Zen. Her desire to have him all to herself seems to balloon by the day, and she longs to know everything about him. So much so that, for the first time, she invites him on a date: a meticulously planned day of activities at the zoo, right down to where they'll watch the sunset together. But when they run into Kuma-who clearly has some kind of history with Zen-Risa struggles with fresh new feelings of unease.