| Title |
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| Play time | Unknown | ||
| Developer | Triangle | ||
| Publishers | Triangle & Dennou Club | ||
| Relations |
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DescriptionMain character observes his sisters masturbating every night before going to sleep. As a brother, he decides to guide them. But as he starts to use information observed at night sessions during daytime conversations, but the relations between the siblings start to change at this point... | |||
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| Kojima Keisuke児島 圭介 | |
| Hair | Brown |
| Role | Full Brother |
| Kojima Hibiki児島 響 | |
| Measurements | A cup |
| Hair | Brown, Parted in Middle, Shoulder-length, Twin Tails |
| Eyes | Red |
| Clothes | Hair Tie, Jeans, One Piece Swimsuit, School Uniform, Spats, Tank Top, Watch |
| Role | Younger Sister |
| Voiced by | Enokizu Mao |
| Kojima Kirika児島 霧花 | |
| Measurements | E cup |
| Hair | Black, Waist Length+ |
| Eyes | Violet |
| Clothes | Bikini, Decorative Belt, School Uniform, Skirt |
| Role | Older Sister |
| Voiced by | Moegi Yui |