Keiko, an AI robot who has been living with the Koyama family educating their daughter Airi, is experiencing an increase in operational mistakes. Airi’s mother plans to replace Keiko with an upgraded version, but Airi refuses.
| Actor | Role |
|---|---|
| MMinami UrushibataAiri Koyama | Airi Koyama |
| AAika KamimuraKeiko | Keiko |
 Yuki InabaAlternative AI | Alternative AI |
| HHono MiyabeRiko Koyama | Riko Koyama |