**Fukutome Kai (21)**, who lives with his mother in **Shin-Ōkubo, Tokyo**, is attacked by a stranger while walking his childhood friend **Rika (21)** home after his mother **Sachie's (53)** birthday party. Kai and Rika manage to escape the scene for the time being, but days later, his best friend **Park Yoo-jun (21)**, a Korean-Japanese, is killed by that same man. Not only Yoo-jun, but Sachie and Rika are also caught in the aftermath. Rika is left unconscious and in critical condition, and **Sachie passes away**. Triggered by this tragedy, Kai uncovers several shocking truths: - Yoo-jun was a **spy for Country N**. - He has a **long-lost twin brother**, **Lim Jin**, a member of the hugely popular K-POP boy group **Little Gang**. - His estranged father, **Lim Do-hyeon (53)**, is living in **South Korea**. Kai's fate begins to shift dramatically overnight. To avenge his mother and his best friend, and to discover his roots, he travels alone to **Seoul**. **What awaits him there...!?** *Source: Amuse Creative Studio, translated*

A 6 chapter promotional manga for the *Space-Time Detective Genshi* anime, that is an anime adaptation of the earlier manga from 1998.