Mukai Yumiko
向井 裕美子
| Mukai Yumiko向井 裕美子 | |
| Hair | Blond, Long, Ponytail |
| Eyes | Blue |
| Body | Pale, Young-adult |
| Clothes | Bikini, Pajamas, Pendant Necklace, Pinafore Dress, Skirt |
| Personality | Kind |
| Role | Mother, Popular, Widow |
| Visual novels | Main character - Nami no Mani Mani ~Sazanami Shinryoujo~ Main character - Nami no Mani Mani Gaiden Yumiko-san no Shinkon Nikki |
| Voiced by | Gogyou Nazuna (Included in voice change patch) Misaki Yuuka |