After being treaten like an outsider her whole life, Mayumi has long gave up on trying to fit into any social group.. But now that she finds herself at High School, surrounded by new people and oportunities, she decides to try again... Only to find herself hurt and dissapointed again..

Closing her heart off completely and building walls around herself, she vowes to herself never to get hurt again... But when a new girl transfers into her class, she finds herself slowly opening her heart little by little..