| Age: | Teens-20s |
| Occupation: | Idol Singer |
| Location: | Beika City |
Okino Yohko is a famous idol singer. She got her start in the group the "Earth Girls." She regularly appears on TV and in concerts. She is Mouri's favorite celebrity. She has a sweet, perky personality both in public and private.
| Story Arcs | Volumes | |
| Featured in: | 3, 93 | 1, 32 |
| Appears in: | 28, 84 | 11, 29 |
| Mentioned in: | 44, 47, 120 | 16, 17, 40 |
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