In "Ikemen Sengoku: Bromances Across Time," Sasuke Sarutobi, a typical Kyoto University student, spends his leisure time researching time travel theories until he is suddenly whisked away to the Sengoku period. There, he meets historical figures such as Toyotomi Hideyoshi, Tokugawa Ieyasu, and the infamous "Demon King of the Sixth Heaven," Oda Nobunaga, who takes Sasuke on as a vassal. By introducing modern novelties like tennis and chain letters, Sasuke gradually carves out a distinctive role for himself in this era, finding it both challenging and refreshingly new.