Eureka Baby
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Disc1
| 1 | Eureka Baby | Natsuko Aso | 3:52 |
| 2 | Pop step trip! | Natsuko Aso | 3:54 |
| 3 | Eureka Baby (instrumental) | Natsuko Aso | 3:52 |
| 4 | Pop step trip! (instrumental) | Natsuko Aso | 3:51 |
| 1 | Eureka Baby | Natsuko Aso | 3:52 |
| 2 | Pop step trip! | Natsuko Aso | 3:54 |
| 3 | Eureka Baby (instrumental) | Natsuko Aso | 3:52 |
| 4 | Pop step trip! (instrumental) | Natsuko Aso | 3:51 |