Namiko Watanabe

Namiko Watanabe (渡辺 菜三子 Watanabe Namiko) is a character from the original oneshot who dates Ichirō Yamanaka until she is being blackmailed by Hidenori Shiga into dumping him. Once the issue is resolved that Ichirō accepts Nanako Watanabe's death, they visit her sister's grave together as a final goodbye.

Backstory
Namiko had a twin sister named Nanako Watanabe who died in an accident before graduating middle school and she is forced to pretend to be her because Ichirō Yamanaka can't accept Nanako's death.

Etymology

 * The name Namiko means "vegetables, greens" (菜) (na), "three" (三) (mi) and "child" (子) (ko).
 * Namiko's surname Watanabe means "cross, ferry" (渡) (wata) and "edge, side" (辺) (be).