A girl in an ephemeral dream is always wishing for Ayumu to find happiness. With the death of his parents, Ayumu had a sad life with nothing but regrets. Now he wants to change himself to create happy memories in his second year of high school. But two mysterious girls enter his life, bringing with them a creature that shouldn't exist in this world. In the twisted reality, Ayumu faces the creature to save those girls and find the truth, a truth that may not bring him the happiness he wants.