4Certain his twin is alive, Senri shifts his goal from avenging his brother to finding him. Enan is happy to join the search, relieved to see her friend's face light up with hope after living in darkness for so long. Following the threads of distant memories, Senri uncovers new clues that suggest his parents' involvement in a tangled plot, one that may well have led to their deaths. And now, as events continue to unfold, Senri fears Kazuto may be wrapped up in the sinister dealings of the city's underworld as well. Has the homicidal fire man twisted his kind brother into something unimaginable...?!