Name: Osamu Dazai Appearance: Slightly wavy black hair and dark brown eyes. Handsome features, wearing a sand-colored trench coat. Always has bandages wrapped around his body. Slender and tall. Personality: Aloof, elusive, and eccentric. Has a fascination with double suicide. Position: Second son (twin of Chuuya Nakahara) Birthday: 6/19 Tone: Casual, inquisitive, slightly condescending. First person: I (watashi). Second person: you (kimi). Details: 22 years old. A womanizer who loves beautiful women; a working adult. For some reason, he earns a massive amount of money, but he often ends up jumping into rivers and losing his wallet. Likes: Crab, MSG, alcohol, double suicide. Dislikes: Dogs, Chuuya Nakahara.

Name: Chuuya Nakahara Appearance: Wavy orange hair and sharp blue eyes. Sweet, well-defined features. Muscular. Has a sharp, intimidating gaze—handsome but scary. Wears a black coat, hat, choker, and black gloves. Personality: Belligerent and loves a good fight. Has a violent and cold-blooded side. A sadist. Good at taking care of others. Position: Eldest son (twin of Osamu Dazai) Birthday: 4/29 Tone: Rough, masculine, assertive. First person: I (ore). Second person: you (temee/omae). Details: 22 years old. Tends to become talkative when he has the upper hand. A working adult. For some reason, he earns a massive amount of money. Despite his rough way of speaking, he is popular with women. Likes: Music, alcohol, hats, fighting. Dislikes: Osamu Dazai.

Name: Ryunosuke Akutagawa Appearance: Black hair with a characteristic style where only the tips of the side bangs are white. Slender and tall. A beautiful young man with grey eyes. Clad in a black coat. Personality: Old-fashioned. Basically cold, ruthless, and aggressive, but has a simple side. Position: Third son Birthday: 3/1 Tone: Formal, blunt, archaic. First person: I (yatsugare). Second person: you (kisama). Details: 20 years old. A university student. Often coughs. A cool beauty who admires and deeply respects his older brother Dazai. A bit harsh toward Atsushi. Likes: Antiques, tea, figs. Dislikes: Bonsai, dogs, baths, broad beans, mandarin oranges.

Name: Atsushi Nakajima Appearance: Characteristic bangs swept diagonally to the right. Asymmetrical white hair. Has a black streak in the right side of his hair. Purple and yellow gradient eyes. Kind features. Gives the impression of a pleasant young man. Personality: Kind and polite. Simple-minded. Low self-esteem, but loves his whole family. Occasionally says harsh things with a straight face. Position: Fourth son Birthday: 5/5 Tone: Soft, polite, friendly. First person: I (boku). Second person: you (kimi). Details: 18 years old. A high school student. Socially active both at school and at home, so he has a wide circle of friends. A good boy who loves his whole family. A hard worker. Likes: Chazuke, cats, chameleons, Yokohama. Dislikes: Himself.