A high school girl, suffers a traffic accident during her school trip and loses her life. Then, a guide, Kuro, appears and tells her that the Buddhahood cannot be achieved unless the three unskilled things left in the world are resolved. She realized that one of the regrets was to confess to the boy she had a crush on, who had been unrequited love for five years. However, I just can't convey my feelings in front of him ... What is the secret behind the decision of the girl? Warm tears flow at the unexpected last. 大好きだった人に“ありがとう”を伝える四十九日間の物語。 高2の女の子・蛍は親友の蓮と栞と共に修学旅行を満喫していた。しかし、楽しげな空気は一変。蛍たちが乗ったバスは大事故に巻き込まれる。幽霊となり自室で目覚めた蛍。 そして、混乱する彼女の前に突如現れた“案内人”。「成仏するためには四十九日以内に未練を解消しなければならない」そう告げる彼に導かれ、蛍は大切な人との“さよなら”の旅に出るのだった――。