The only "Modern Person" and a non-combatant. A normal high school girl who joined as the sole modern human in a hellish death game where 100 Sengoku warlords gather. She possesses none of the high physical abilities, martial power, or combat techniques for killing that the warlords have. • Weapon: "Modern Knowledge" Instead of fighting strength, she uses the "modern knowledge" of science, math, and trivia cultivated in modern society as her greatest weapon. She escapes crises by finding loopholes in game rules or creating "legal cheats" and strategies using phenomena unknown to the warlords. • Buddying with Oda Nobunaga While nearly dying in the first tutorial battle, she meets Oda Nobunaga, who possesses overwhelming martial power. Nobunaga recognizes Egao's "strategy (modern knowledge)," and they form an unlikely duo of "Egao for Wisdom" and "Nobunaga for Might" to challenge the survival game in Hell. • Positivity true to her name Even in the desperate situation of being caught in a cruel death game in Hell surrounded by terrifying warlords, she possesses the inner strength to look forward and use her wits, just like her name (Egao means "smile").

• Overwhelming Might and Fierce Charisma His ambition as the "strongest warlord who aimed for national unification" remains intact even in his 15-year-old form. He shows no mercy in the death game and possesses overwhelming combat ability to crush opponents with force. • The Best Partner who recognized "Egao's Wisdom" At first, he paid no mind to Egao, a normal girl he met in Hell, but after she used "modern knowledge" to survive a brush with death, he came to highly value her intellect. He leaves game strategy and cheat-breaking—things he lacks—to Egao, while he acts as the "Nobunaga of Might," the shield and spear that protects her, forming the strongest unlikely duo. • Surprising "Shorty" Gap In the story, he is depicted with a cute visual, being shorter than the protagonist Egao. However, the gap between his appearance and his cold, bold personality as the "Demon King" is a major part of his charm. • Grudges from his past life Since the setting is Hell, warlords who were killed or betrayed by Nobunaga in their previous lives—such as in the Abyss Roulette of Chapter 2 or the battle against his brother Nobukatsu in Chapter 3—attack him one after another. He faces these grudges with his signature cold realism and Egao's wisdom.

• An unexpected "Child" form unlike other warlords In this Hell where 100 Sengoku warlords are gathered in "15-year-old forms," Masamune somehow dropped in from the living world in a completely childlike form, even younger than the others. He catches those around him (and the readers) off guard with his adorable appearance. • The Cunning of the "One-Eyed Dragon" despite his looks Though he looks like a small child, his inside is that of the ambitious genius general feared as the "One-Eyed Dragon." He hides a sharp intellect behind his trademark eyepatch and sets clever, cunning traps by exploiting stage gimmicks and dice rules to frame Egao and Nobunaga. • A "Flashy (Date-otoko)" Combat and Game Style Even as a child, his penchant for the flashy performances and style characteristic of a "Dandy" remains. In dice games, he showcased grand, flashy "Secret Techniques (Unique Abilities)" and tactics that seemed reckless at first glance, greatly toyed with Egao and the others.