西野 純夫

Riho's husband, the heroine's spouse. He prioritizes work above all else, leaving all childcare and household duties to Riho. Consequently, a deep rift has begun to form between him and his wife, Riho.

While Sumio now thinks only of work and neglects his family, immediately after marrying Riho, he was a devoted husband who willingly took charge of household chores for her when she was pregnant with Ryota.

However, after Ryota was born safely, Sumio began to believe that by working hard and earning a high income, he could make Riho, Ryota, and their family happy. He became increasingly absorbed in his work.