Shokatsu Kōmei, historically recognized as Zhuge Liang, was a military strategist from China's Three Kingdoms era who perished in 234 AD at the Battle of Wuzhang Plains. With his final breath, he yearned for rebirth into a conflict-free age. This plea transported him to modern Shibuya during a Halloween celebration, where he manifested with youth contrasting his lifetime.

In contemporary Tokyo, he discovered Eiko Tsukimi, an aspiring vocalist performing at a nightclub. Her emotionally resonant singing stirred him profoundly, revealing music's capacity to move hearts. Inspired, he resolved to become Eiko's strategist, dedicating himself to her ascent in the music industry. Despite his ancient origins, his sharp intellect and tactical prowess enabled swift adaptation to modern society.

Employing historical military strategies for Eiko's career, he engineered promotional campaigns and navigated industry obstacles. His masterstroke involved coordinating "The Orion of 4 Years Ago," a landmark music event uniting three major labels. This triumph birthed the record company "Fourth Kingdom," cementing Eiko as its flagship artist. Throughout their collaboration, their relationship remained strictly professional, devoid of romantic entanglement.

His character echoes historical parallels as a strategist, though his modern existence focuses solely on Eiko's musical ambitions. Within the "Road to Summer Sonia" film compilation, his arc adheres strictly to established events, introducing no new developments.