Michiru Saiki

Michiru Saiki was Arata Kaizaki's Senpai from his former company who supported him as a newbie employee but due to constant harassment from their coworkers drove her to commit suicide which led Kanzaki to quit the company after working for only 3 months after employment.

Relationships
Arata Kaizaki - Michiru was Kaizaki's Senpai and major supporter throughout his time in the same company. He described her as bright and cheerful person. At the time in the company, she was pressured and harassed by coworkers which led to her suicide. Kaizaki never really recovered from the incident and was unable to move on until the ReLIFE project. Kaizaki was finally able to move on after visiting her grave and send his thanks for her guidance, and apology for being unable to support her.