Everyone throws a surprise party for Nano.

Mio discovers Kojiro with Misato and goes on a rampage across town.

Yuko shocks Mio by telling her she saw Kojiro kissing Nano; both Mio and Misato dream of Kojiro that night. Nano takes care of an ill Sakamoto, so the Professor fakes being sick too.

Mio is made to taste fish jam. Izumi and Makoto fight about a dirty magazine in Makoto's room.

The Professor and Nano force Sakamoto out for a walk, and encounter Mai and her dogs.

Mr. Takasaki tries to get close to Izumi. Yuko dreams about Mio's hairbands again.

Mio tries to make a comic with the help of her friends, a task they make worse. The Professor plays hide-and-seek with Nano and Sakamoto.

Yuko tries to help Mio perform a high jump, and succeeds through an accidental head-butt. The Professor gets the laundry dirty and blames Sakamoto for it, prompting Nano to give her no dinner.

Yuko gets into a hassle at one restaurant with a complicated menu, and another restaurant where a girl laughs at her. She later wants to dress up in a fancy costume.

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.

Mio's bag, which contains a dirty picture of Koshiro, gets confiscated and she knocks out anyone and everyone in her path to get it back. Yuko pays Nano a visit.

Nano wishes to remove her distinct robotic features, but the Professor instead installs a function that causes her to go haywire.

Nano starts school. Makoto Sakurai joins the soccer club.

The Professor learns of Nano's wish to go to school, and prepares a school uniform for her.

Yuko forgets her homework, and later at a theme park enters a stupor when she realizes she has no money.

After having a cold for three days, Yuko learns of a test and struggles to prepare for it. The Professor makes super glue that she, Nano and Sakamoto get stuck in.

Yuko ends up late, and is subject to pranks by Mai; she later thinks about her future. The Professor acts like an adult, to the dismay of Nano and Sakamoto.

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 tells jokes to Mio and Mai, but she is unable to make them laugh. Misato tries to hide her feelings for Kojiro, in vain.

Yuko daydreams about Mio's hair-bands. Nano, Sakamoto and the Professor play baseball without any idea of the rules.

Yuko plays a spelling game with Mio, watches her principal wrestle a deer, and later goes on a camping trip.

Ms Izumi hires Yuko to draw for the school paper, to Mio's astonishment as she feels she is a better artist. With effort, Mio gets her drawing in the paper... of a half-naked Kojiro!

Guidance counselor Izumi Sakurai tries to enforce rules on the students, in vain.

Nano and the Professor bring home a cat, whom they name Sakamoto and give it speech. Yuko gets into an arm-wrestling match with Mai.

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 blows up. Yuko goes to drastic measures to preserve her lunch, and does a trick with a fire alarm. Kojiro makes a scene about his pet goat.