The adventures of 3 girls as they learn their most important lessons the hard way. A professor makes life difficult for a robot who just wants to be normal.
While the title suggests a story of simple, everyday school life, the contents are the opposite.
Nano blows up. Yuko goes to drastic measures to preserve her lunch and does a trick with a fire alarm.
Mio is chased by a strange girl. Later, she gives her notebook to Yuko only to remember she drew a dirty picture of Kojiro in it and tries to get it back.
Nano and the Professor bring home a cat, whom they name Sakamoto and give it speech.
Guidance counselor Izumi Sakurai tries to enforce rules on the students, in vain.
Yuko helps Ms. Izumi to draw for the English test, to Mio's astonishment, as she feels she is a better artist.
Yuko plays a spelling game with Mio, watches her principal wrestle a deer, and later goes on a camping trip.
Yuko daydreams about Mio's hairbands. Nano, Sakamoto and the Professor play baseball without any idea of the rules.
Yuko tells jokes to Mio and Mai, but she is unable to make them laugh. Misato tries to hide her feelings for Kojiro, in vain.
Mio is baking cakes, but they are repeatedly ruined by Yoshino's pranks. One prank in particular results in her getting employed as a daifuku mascot.
Yuko ends up late, and is subject to pranks by Mai; she later thinks about her future.
After having a cold for three days, Yuko learns of a test and struggles to prepare for it.
Yuko forgets her homework, and later at a theme park enters a stupor when she realizes she has no money.
The Professor learns of Nano's wish to go to school and prepares a school uniform for her.
Nano starts school. Makoto Sakurai joins the soccer club.
Nano wishes to remove her distinct robotic features, but the Professor instead installs a function that causes her to go haywire.
Mio's bag, which contains a dirty picture of Kojiro, gets confiscated and she knocks out anyone and everyone in her path to get it back.
The Professor makes a crow talk, to Sakamoto's jealousy. Mio and Yuko build a house of cards, an arduous task complicated by Nano and Mai.
Yuko gets into a hassle at one restaurant with a complicated menu, and another restaurant where a girl laughs at her.
Yuko tries to help Mio perform a high jump and succeeds through an accidental headbutt.
Mio tries to make a comic with the help of her friends, a task they make worse.
Mr. Takasaki tries to get close to Izumi. Yuko dreams about Mio's hairbands again.
The Professor and Nano force Sakamoto out for a walk, and encounter Mai and her dogs.
Mio is made to taste fish jam. Izumi and Makoto fight about a magazine in Makoto's room.
Yuko shocks Mio by telling her she saw Kojiro kissing Nano; both Mio and Misato dream of Kojiro that night.
Mio discovers Kojiro with Misato and goes on a rampage across town.
Everyone throws a surprise party for Nano.
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