The daughter of the ruler of the ocean, where it is always dark, visits the world above where it is always day. She falls in love and decides to stay, but she misses the dark and asks her father to send her some darkness.
Muffy and Fluffy, twin kittens who do not think alike, have trouble agreeing on anything until they discover that it is fun to take turns making choices.
Mouse friends Jen and Ken have an accident that spoils the Valentine's Day surprises they have made for each other, but they soon find other ways to celebrate together.