| Title |
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| Aliases | Mai Sister ~Sweet Gemini~, Boku no Imouto, Sweet Gemini, まい☆しすたぁ, 妹☆妹(まい☆しすたぁ) ～Sweet Gemini～ | ||
| Play time | Unknown | ||
| Developer | Ripe | ||
| Publishers | Ripe | ||
| Shops | sponsored links» JP¥ 2750 @ DLsite | ||
DescriptionThe game's objective is quite simple. You are a 'brother' and you need to 'take care' of your 'sisters' and 'friends'. There are 5 heroines in total. | |||
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| Aizawa Kyousuke藍澤 恭輔 | |
| Body | Slim, Young-adult |
| Role | University Student, Writer |
| Aizawa Kaho藍澤 華穂 | |
| Hair | Ahoge, Orange, Short |
| Eyes | Blue |
| Clothes | Hair Ribbon |
| Personality | Atashi, Carefree, Funny, Selfish, Sweets Lover |
| Role | Step Sister, Twin Sister, Younger Sister |
| Voiced by | Kimura Ayaka (Mai Sister releases) Nakamichi Mika |
| Aizawa Maho藍澤 眞穂 | |
| Hair | Ahoge, Blue, Waist Length+ |
| Eyes | Brown |
| Clothes | Glasses, Hair Ribbon, School Uniform |
| Personality | Docile, Mature |
| Role | Older Sister, Step Sister, Twin Sister |
| Engages in | Cleaning, Cooking |
| Voiced by | Kaibara Elena (Mai Sister releases) Saaya |
| Himuro Sayaka氷室 さやか | |
| Hair | Violet |
| Eyes | Red |
| Body | Young-adult |
| Clothes | Earrings, Shirt, Skirt |
| Role | Ex-girlfriend, Wife |
| Voiced by | Hazaki Minato Suzumi Tomoe (Mai Sister releases) |
| Miya美也 | |
| Hair | Brown, Twin Tails |
| Eyes | Brown |
| Clothes | Hoodie, Skirt |
| Items | Stuffed Toy |
| Personality | Curious, Immature, Shy |
| Role | Cousin |
| Voiced by | Inaba Miko Naruse Mia (Mai Sister releases) |
| Rioリオ | |
| Hair | Brown |
| Eyes | Green |
| Body | Young-adult |
| Clothes | Shirt |
| Personality | Kind |
| Voiced by | Misaki Tomomi (Mai Sister releases) Shinano Azusa |