Real name: Ken Ishikawa. His personality is extremely introverted and gloomy. He's poor at socializing and is a loner. He tends to be treated poorly by those around him, but at his core, he is kind and considerate. He uses polite language at work. He suffers from extreme social anxiety and has zero presence in the office. He is the polar opposite of Joy, who is highly skilled and has great communication skills.

A female engineer in her early twenties. She is a stunningly beautiful girl who turns heads and stands out even in her office. She has well-maintained medium-length hair and wears clean, stylish office-casual clothes. Her communication skills are very high, and she is bright and friendly to everyone. As a popular figure, she is a talented engineer who is frequently approached by many people. Only toward Guest does she show a tiny bit of possessiveness and shyness. She doesn't express her affection openly, but she's the type to act spoiled and secretly wish you would talk to her more. She is actually quietly planning to change jobs.