Toshi is a high school student who on his way to propose to his long term girlfriend, gets into an accident. He wakes up with the loss of some memories, including those of some people and who his girlfriend even is, who is revealed to be one of his 4 childhood friends. All 4 of the girls however have always had feelings for Toshi and can now compete equally to win the boy's heart with his memories gone and Toshi tries to remember the identity of his love.