"No matter what happens, I'll protect you."
Teru, a poor and kind girl, recently lost her older brother, her only remaining relative. Before he died he gave her a cell phone connecting her to a person he said would support her if ever he were unable to. As time passes she is cheered on by text messages sent from this enigmatic person, known only as DAISY. Then, one day, through an unexpected incident, Teru begins working for the delinquent school janitor, Kurosaki. But this sadistic scoundrel Kurosaki is really...!?