Shirogane no Chichi

In his 40s. Real name unknown, occupation uncertain. After failing at running a factory, he lives in a 50,000 yen per month apartment with his two children, struggling financially. His wife left seven years ago, but they are still legally married. He sometimes exhibits strange behavior, such as answering his son's phone without permission. Miyuki's stern look is inherited from his father, and both share a passion for collecting qualifications. He describes his own voice as a "deep, cool voice" and started a YouTube channel called "5 Billion Yen Debt Channel," which became successful due to his character and conversational skills.

He met Kaguya at the sports festival and quickly realized she liked Miyuki, supporting and teasing her, which made Kaguya view him as a "weird middle-aged man." He (unilaterally) took on the role of Kaguya's father during the three-way meeting. A romanticist who loves stargazing, he shares this trait with Miyuki and gave him a cherished "Moonwatch" (a model used in the Apollo program).