Teru is left all alone after her brother dies, possessing only the cell phone he gave her to keep her company. Through this device, she discovers the friend her brother left behind: one who calls himself DAISY. Teru's feelings for DAISY become brotherly, as he is always present in the shadows, protecting and encouraging her via messages and occasional physical acts (such as throwing tennis balls at bullies from a distance or hacking the school computer system at her request). However, their relationship never extends beyond Instant Messaging. At the start of the manga, she is bullied by the student council; after being maliciously drenched with a hose, a mysterious ball flies onto the scene, scaring the bullies away. As she attempts to return the ball, she accidentally throws it through a school window. This leads to her meeting the school janitor, Tasuku Kurosaki, who demands payment for the broken window. Upon learning that Teru is financially incapable of paying, he makes her work off the debt by performing his janitorial duties in his place, effectively making her his "Slave." As the manga progresses, Teru's initially negative feelings toward Kurosaki evolve into something more romantic. Yet, her suspicion grows that Kurosaki is actually her beloved ally DAISY, and that the phone her brother left her might be more than it appears.
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