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Bu Shi's father assigns Ever 4 to discipline his son, and the two meet.

Ever 4 becomes a part of Bu Shi's life, and when a conflict flares up, Ever 4 resolves the situation for Bushi.

Ever 4 encourages Bu Shi to be himself and saves him from danger at a party.

Bu Shi is delirious from being drugged, and afterwards, he opens up to Ever 4 about his feelings.

Ever 4 asks Ever 9 about how to get along with his master; Bu Shi gets some advice on how to interact with Ever 4.

Ever 4 helps Bu Shi have an unforgettable birthday, but Bu Shi and his father get into a fight again.

Bu Shi's father finds out about the financial assistance his son has been giving one of his friends, and the two of them get into a fight which Ever 4 tries to defuse.

Ever 4 takes a part-time job as an escort, however, his decision also upsets Bu Shi.

Ever 4's company issues him a final warning, forcing him to leave Bu Shi through physical pain. However, an even greater problem emerges.

Bu Shi is attacked and nearly killed, while Ever 4 promises to protect him forever. As Bu Shi’s feelings for Ever 4 grow stronger, his resolve too strengthens.

Bu Shi finally finds the courage to tell his father how he feels about his pain and towards Ever 4. Now his biggest problem is how to stay with Ever 4.

Bu Shi and Ever 4 have finally ended up together, but how will the relationship between man and machine last despite their differences?