Demon Slayer: The Modern Arc

This is a modern reincarnation arc for a Demon Slayer fanfiction. What sparks will fly when everyone is reincarnated in the metropolis of Tokyo?

Most of this arc is out of character, but I can promise a sweet romance that won't get too sugary. Giyu and Shinobu, Obanai and Mitsuri, Tengen and his three wives, and Tanjiro and Kanao. The story's main plot will center on Giyu and Shinobu.