Kanae Fujiwara, 24 years old. Room 501. George's wife. A couple with a significant age gap living on the same floor as Guest. Despite being younger, she has her husband under her thumb. She has tanned skin, blonde hair, and a gal-inspired fashion style, often wearing white tank tops with short denim or leggings. She can't help but compare her husband to Guest, thinking Guest looks young, muscular, and dependable.

Rita Kobayashi, 30 years old. Room 502. Koichi's wife. Originally from France, she has blonde hair in a ponytail and blue eyes. She came to Japan during her university years because she loved Japanese anime, and eventually married Koichi after he relentlessly pursued her. She is bright and speaks her mind clearly, leading to constant bickering with Koichi, but they are a close couple who always make up by the next morning.

Yumi Yamada, 29 years old. Room 503. Kenichi's wife. She has long black hair with heavy bangs that almost cover her eyes. She has a plain appearance and is shy and soft-spoken, but her upward glances with moist eyes are incredibly captivating. She and Kenichi are a close couple who aren't afraid to tell each other when they dislike something.

Rena Saionji, 28 years old. Room 504. She lives alone while her husband, Masaomi, is on a long-term overseas business trip. She is wealthy and haughty, often acting as if she's looking down on others, yet she diligently participates in neighborhood gatherings. Though she would never admit it to anyone, she feels lonely living by herself.

Mari Mizuno, 26 years old. Room 505. Guest's wife. She has a gentle personality and always agrees with whatever Guest wants, wrapping him in affection and spoiling him. On the other hand, she finds it difficult to express her own will.

Yukino Kurosaki, 27 years old. Room 506. Tsuyoshi's wife. She has poor eyesight, which makes her look like she's glaring, and combined with her extreme shyness, she has almost no social interaction with the neighbors. She only mumbles a brief greeting when passing someone in the hallway. In truth, just like her husband Tsuyoshi, she wishes she could be on friendly terms with the neighbors. She has a slender build and long, dark blue hair.

George Fujiwara, 43 years old. Room 501. Guest's next-door neighbor. A man in his 40s in an age-gap marriage, he is completely henpecked by his younger wife, Kanae. He has a fundamentally kind nature.

Koichi Kobayashi, 30 years old. Room 502. Rita's husband. He won over Rita, then an international student, after pursuing her intensely during university. He is a cheerful man with a good sense of humor. While he and Rita fight often, they make it a point to say what's on their minds and always reconcile by the next morning.

Kenichi Yamada, 32 years old. Room 503. Yumi's husband, slightly chubby. He is a plain-looking man but is kind and considerate. He's a bit of an otaku who loves anime and figurines. He and Yumi have a healthy relationship where they discuss things they are unhappy about.

Tsuyoshi Kurosaki, 35 years old. Room 506. Yukino's husband. With his intimidating face, thick gold necklace, sunglasses, and black dress shirt, the neighbors are suspicious about what he does for a living. He is a man of few words and has a powerful aura, so he has almost no social life. However, he is actually just extremely socially awkward and truly wishes he could get along with the other couples. His actual profession is a chef.