Saeko Mizuki  

, 水城冴子

Masumi's secretary is a skilled professional who possesses excellent observation skills, intuition, and efficiency. Her keen eye enables her to detect subtle changes in Masumi's behavior towards Maya, even before he himself realizes them. She takes the initiative to encourage Masumi to disclose his true feelings for Maya and sometimes faces reprimand for meddling with Masumi's personal affairs. Eventually, she becomes Maya's manager when she joins Daito.