Shizuku (雫 Shizuku, lit. "Drip") is an adult visual novel by Leaf originally released for DOS on January 26, 1996. It has since received releases for Windows. The sequel is To Heart, because in To Heart ~Remember My Memories~, Yūsuke and a deceased Mizuho appears.
- Yūsuke Nagase (長瀬 祐介 Nagase Yūsuke)
- The game's protagonist.
- Saori Shinjo (新城 沙織 Shinjō Saori)
- Voiced by: Sakura Takatsuki
- A cheerful and talkative member of the volleyball team. She is an eyewitness to a certain event and is quickly swept up in the aftermath.
- Ruriko Tsukishima (月島 瑠璃子 Tsukishima Ruriko)
- Voiced by: Sakura Ichinomiya
- A former classmate of Yūsuke's. She can often be found reading books in a secluded area.
- Kanako Ota (太田 香奈子 Ōta Kanako)
- Voiced by: Kaoru Imai
- Yūsuke's classmate and vice-president of the student council.
- Mizuho Aihara (藍原 瑞穂 Aihara Mizuho)
- Voiced by: Mai Tachibana
- The shy student council secretary with a hidden stubborn side. She has been best friends with Kanako since middle school.
- Genichiro Nagase (長瀬 源一郎 Nagase Gen'ichirō)
- Yūsuke's uncle and a teacher at the same school. He often provides useful advice in relation to the game's events.
- Takuya Tsukishima (月島 拓也 Tsukishima Takuya)
- Voiced by: Daisuke Tanaka