Tập 1: Naota gặp Haruko sau sự cố nụ hôn ở cổ trong cuộc sống thường nhật ở Mabase

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Naota Nandaba and his friend Mamimi Samejima are hanging out underneath a bridge. Mamimi then begins to kiss Naota's neck. He asks why she always does that and she replies that she has to or she will overflow, presumably emotionally. Naota narrates his life in the city of Mabase as being "ordinary" and "nothing ever happens there." Naota and Mamimi buy a drink from a vending machine and Mamimi points out a hickey on Naota's neck, when they are interrupted by the arrival of Haruko Haruhara, who runs over Naota with her Vespa scooter, gives him CPR, then hits him on the forehead with a left-handed bass guitar. The blow leaves a large, horn-like bump which Naota covers with a bandage. The next day, his classmates tell rumors about the "Vespa woman" and how getting hit by the Vespa leaves a mark that shows you've been doing perverted things. He's then stalked by Haruko as he goes to the hospital after school. Haruko turns out to be the nurse and Naota runs away. After returning home, Naota finds Haruko working in his house as a live-in maid. Haruko settles in Naota's room. However, Naota and Haruko argue about where she will sleep and Naota says she should stay with his father. He goes downstairs, where his father says that Mamimi came by to get the day old bread from their bakery and inquires if Mamimi's family is poor. When Naota goes to find her, she tells him how much she likes his brother, who lives in America because of his professional baseball career. Naota reveals to her that his brother has an American girlfriend. Mamimi suddenly says she's overflowing. A robot and a detached piece of another from Medical Mechanica come out of the bump on his head and begin fighting, only to have the battle end with Haruko hitting the robot with her guitar. (Source: Wikipedia)