As Valentine's Day approaches, Froggy thinks that he is falling in love with the new girl in class, but his feelings change when she gives him their first kiss.
Doug discovers that though being Harry's best friend in Miss Mackle's second grade class isn't always easy, as Harry likes to do horrible things, it is often a lot of fun.
Froggy hoped for a brother to play with so he is disappointed with his new baby sister, Pollywogilina, but only until she is old enough to start learning from her big brother.