Tooru possesses an exceptional ability to turn invisible without the use of magic. Only Tsumugi, his childhood friend, can see him and this causes Tooru to develop a deep love for her. However, when he accidentally takes away a witch's powers, Tooru fears the worst until the witch offers to help him win over Tsumugi. The catch: the only way to restore the witch's powers is through a kiss. Tooru's ability to disappear is in danger, that much is certain.