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Keiko Koizumi (小泉 螢子 (こいずみ けいこ) Koizumi Keiko) was the sister/girlfriend of Eiji Tono who boarded his father's ship on a trip. Unfortunately, the ship capsized and sank while Eiji found Keiko's body after the police fished it up. She was holding a tag with the initials S. K., prompting him to seek revenge on whoever was named S. K. and that was on board the ship. It turned out Keiko was pulling on a lifeboat and she was slowly dragging it into the water, which led Seisaku Koda to pull her off the lifeboat, thus letting her drown to death.
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- The name Keiko means "firefly" (螢) (kei) and "child" (子) (ko).
- Keiko's surname Koizumi means "small" (小) (ko) and "spring, fountain" (泉) (izumi).