Hideki gets a date with Yumi. While he's out, Chii reads the sequel of her book, which awakens a part of her memory. As a result, she meets a mysterious girl who looks exactly like her, named Freya, who seems to know everything about Chii's past that Chii does not.

Hideki and the entire gang are invited to hang out at Minoru's beach home for the weekend to study and to have a lot of fun. This is Chii's first time at the beach. But with Hideki not knowing how to swim, and with Chii going in the water, what's a guy to do?

Hideki's in trouble grade-wise, so Ms. Shimizu advises he prepare for a practice exam. Hideki gets ready for studying, but loses his wallet. Chii tries to help him out by cooking for him.

Chii is still in the hands of her abductor as Hideki searches for her. After he talks to Mr. Ueda about Chii missing work, they decide to search for Chii together, and Mr. Ueda talks about his marriage to his last Persocom.