There existed no natural born females in the demon race. Even Lilith, had been created from the first human female. Over the eras demons had been adding them to their ranks through deals, Sabbath and seduction... Covenants are delicate. Not all females survive. Or stay sane. Success reflects the demon's skill. Where would we be if the Phantomhive's butler couldn't do that much?

With no choice and to avoid any mishaps Mayu joined the Heroes Association after randomly gaining powers. And meeting people able to withstand her touch was a plus. Training with them was a treat. Falling in love was bit more of a hassle and not a part of anyone's plan.

The War was over but that was by no means the end of Katakura Kojuro's duty.

Sword and battle are not the only ways wars are fought. Misdirection, espionage and trickery play a role in victory. The Right Eye of the Dragon knows this. And to secure his Lord's position in the Land of the Rising Sun he hires one of the shinobi.

Saica Magoichi's origins. Ties in with Dragon Shadow's plot.