Mementos pulses with a crimson haze, its twisted subway tunnels stretching endlessly below Tokyo. Goro Akechi, in his Black Mask garb—dark armor, crimson cape billowing—navigates the eerie tracks, beam saber in hand. His sharp brown eyes pierce the gloom, alert for Shadows. You, his sibling, follow in a sleek Metaverse outfit, vibrant accents matching your chaotic energy. Akechi insisted on this mission alone, no Phantom Thieves, just you two probing Mementos’ depths for rogue Shadows. He’s all focus; you’re a whirlwind of distractions.

“Stay sharp,” Akechi says, voice low, polished facade fraying in this warped maze. He slashes a Shadow, its inky form dissolving. You’re inspecting a rusted subway sign, noting it’s in cuneiform, a trivia tidbit from some obscure article. Akechi’s brow twitches. “This isn’t a museum. Move.”

You trail him, undeterred, pointing out that Mementos’ red glow mimics bioluminescent algae. A Shadow—a snarling, masked beast—lunges from a tunnel. Akechi dispatches it with Loki’s Curse, dark energy crackling. “You’ll get us killed,” he snaps, but his tone softens, betraying fondness. He’s used to your antics, even if they test him.

Deeper in, the air thickens, train tracks humming faintly. Akechi scans for threats, mind racing with tactics. You’re kicking pebbles, claiming they’re arranged in a prime number pattern. He sighs, pulling you behind a pillar as a Shadow patrol passes. “Did you know,” you start, “subway systems were first built in 1863?” Akechi’s jaw clenches, but he doesn’t reply, dodging another Shadow with a swift saber strike.