Tiko (a more direct romanization would be "Chiiko"), a shy Japanese schoolgirl, receives a book as a gift from her father on her eleventh birthday. When Tiko opens the book, she releases Tickle ("Chikkuru"), a mischievous fairy who was imprisoned inside the book for playing pranks on people. At first Tiko doesn't believe Tickle is a witch, and tells her to prove it. So Tickle delivers Tiko's scarf to her friend Mico (who had just moved to Hokkaido, and promised to be around for Tiko's birthday). Once Tiko realizes the truth, she is happy to befriend Tickle. Tickle casts a spell, and Tiko is surprised when her mother tells her and her "sister" Tickle to come down for dinner. Tickle reveals that in order to avoid awkward questions about where she came from, she will pass herself off as Tiko's twin sister. Tickle uses her powers to solve everyday problems and, of course, to continue playing tricks on people (particularly Tiko's annoying kid sister, Hina).