In a Sunday morning Yui Ishida went outside to get calmed by the birds singing because her life got a little bit of stressed. But then she met Hanako Utada and her brother Naoki Utada and together they fighted against a lot of problems and Monsters. while their teamwork got better and better, someone started feeling a strong feeling for someone else, but does she/he loves her/him back? And after her 200st fight against a monster they have to say goodbye. Will they ever meet again?