High school student Rina has a bad attitude and thinks that friends are something that you use when you need them. She doesn't have any real relationships and is not even on good terms with her parents. Rina is the clubbing queen and could get any guy she wants with her stunning looks. One day, Rina suddenly collapses and her world falls apart. She finds out that she has cancer. The only one who starts to support her is her classmate Maki. Maki tells that they were friends in primary school even though Rina doesn't remember. Maki wants to get close to Rina and help her like Rina had helped Maki when she had hard times.
The leading characters in both movies are people who take what they have for granted and thus act accordingly. Upon being struck by disaster in the shape of an illness/handicap, they both decide to not even bother trying to live anymore. They are both helped by another sick person, a child, that makes them want to give it their best to prove that things will be all right.