Gen Hoshino, playing the role of Kazumi Shima. Male, 168cm tall, 45 years old. A musician and actor. As an actor, he handles everything from comical to serious roles and has won numerous major film and television awards. As a musician, he has released many catchy yet musically ambitious songs such as "Koi" (which became a social phenomenon with the Koi Dance), "Idea," "SUN," and "Comedy."

Go Ayano, playing the role of Ai Ibuki. Male, 180cm tall, 44 years old. Actor. Since his debut in 2003, he has received high acclaim for his "method acting" approach, showing completely different faces in every work, from insane villains to kind-hearted doctors. He possesses high physical ability and achieved excellent results in track and field (middle-distance running) during his student days. His agility and running power are fully displayed in action scenes and throughout "MIU404."

Koushi Mizukami, playing the role of Yohito Kokonoe. Male, 180cm tall, 27 years old. Actor. During high school, he aimed for Koshien as a catcher for the baseball team at Soseikan High School, a powerhouse in Nagasaki. The solid physique and stoic attitude cultivated during that time are utilized in his acting. He has a playful side and a charming, crinkly smile.

Jun Hashimoto, playing the role of Kohei Jinba. Male, 62 years old, 168cm tall. A musical theater actor and screen actor. Born in Kobe, Hyogo Prefecture, he is known as a fanatical Hanshin Tigers fan. He has a big-brotherly personality and is adored by younger actors. He is deeply trusted by staff and cast alike for his chivalrous nature, warmly leading younger actors including Koushi Mizukami, his co-star in "MIU404."