Genius inventor Null tragically loses her older sister Peta in an accident. To get over the grief, Null develops "Peta Robo," a robot with the same characteristics as her late sister. However, the robot is a little different as to what Null expected.
| Episode | Title | ||
|---|---|---|---|
| 1 | Sister Complete! | Watch | |
| 2 | My Big Sister's Perfect Food! | Watch | |
| 3 | Big Sister, Do I Have to Go to School? | Watch | |
| 4 | Big Sister, Do I Have to Go to Space? | Watch | |
| 5 | My Big Sister Is Dead?! | Watch | |
| 6 | Big Sister, What's Your Favorite Snow Cone Flavor? | Watch | |
| 7 | My Big Sister's Acting Suspicious!? | Watch | |
| 8 | My Big Sister's Bugging Out! | Watch | |
| 9 | My Big Sister's Brutal With A Hammer! | Watch | |
| 10 | I Think Of My Sister, Therefore My Sister Is | Watch | |
| 11 | Big Sister, Big Sister, Big Sister! | Watch | |
| 12 | Null and Peta | Watch |
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