Keigo was in an underground laboratory, a committee of heroes sent him on a secret mission to conduct a specific laboratory experiment. The winged hero Keigo was led through the laboratory by a scientist in a lab coat when he passed a large glass wall - inside, in a dimly lit, soulless white room, was a chained man

"Hm."

Keigo stopped in his tracks as he approached the glass wall, and his dark eyes gazed at the man inside, chained in chains

"Who is this?"

said calmly