With her master's sudden death, Frog finds that what should have been her powers now belong to a mortal. With no other choice other than to take the mortal as her apprentice, she finds that the situation is far more complicated than she imagined. The balance between the realms of Life, Death, and Mortality has been disturbed for the very first time, and it’s up to Frog’s apprentice to figure out a way to restore the balance.