| Isumi Yayoi伊隅 やよい | |
| Birthday | 10 April |
| Hair | Braid, Green, Waist Length+ |
| Eyes | Amber |
| Body | Pale |
| Role | Older Sister |
| Visual novels | Main character - Muv-Luv Alternative Chronicles: Keishou Main character - Ayu Mayu Alternative |
| Voiced by | Matsuda Mina |
| Isumi Yayoi伊隅 やよい | |
| Hair | Green, Waist Length+ |
| Eyes | Amber |
| Clothes | Headband |
| Visual novels | Main character - Age Maniax ~Isumi Yon Shimai Saigo no Hi~ |
| Voiced by | Inoue Sayoko |
| Isumi Yayoi伊隅 やよい | |
| Measurements | Bust-Waist-Hips: 98-56-86cm |
| Birthday | 10 April |
| Hair | Green, Waist Length+ |
| Items | Motorcycle |
| Role | Older Sister |
| Visual novels | Main character - Kimi ga Ita Kisetsu |
| Voiced by | Sasuga Ichigo |
| Isumi Yayoi伊隅 やよい | |
| Birthday | 10 April |
| Hair | Braid, Green, Waist Length+ |
| Eyes | Amber |
| Body | Pale |
| Role | Older Sister |
| Visual novels | Makes an appearance - Kimi ga Nozomu Eien |
DescriptionMichiru's older sister. | |
| Isumi Yayoi伊隅 やよいO | |
| Measurements | Height: 162cm, Weight: 49kg, Bust-Waist-Hips: 98-56-86cm |
| Birthday | 10 April |
| Hair | Braid, Green |
| Eyes | Brown |
| Clothes | Headband |
| Role | Childhood Friend |
| Visual novels | Main character - Kimi ga Ita Kisetsu ~Primary~ |
| Voiced by | Inoue Sayoko (Full Voice Edition) |