Yuuta Mutsuki has spent the last several years fighting Yoma in a world where he's the only human alive, let alone Shinobi. After battling and killing Orochi, Goza, and a few Generals, he retreats to an untouched island to regain his strength before continuing his goal of killing Yoma and collecting all of the Demon Blades. His "vacation" is interrupted when he senses people on the island with him. He's in for a surprise to say the least. (This will be taking place during Estival Versus, and continue from there.) Cover picture: https://senrankagura.fandom.com/wiki/Yōma