A Reaper's Growth Handbook [Crossover]

A strange young boy appeared outside the Time Government's Kiwami. He had no memories and knew nothing about swords, yet possessed an abundance of spiritual power. The Time Government rubbed their hands together and lured him into becoming a saniwa. Everything proceeded in perfect order.

Until one day, the onmyoji Abe no Seimei and his mother and uncle encountered the amnesiac boy at the Kiwami.

Seimei: He looks kind of familiar.

Tamamo no Mae: More than kind of familiar.

Kuzuha: After searching for so long, he was right here all along.

Crossover, male protagonist, 1v1. The saniwa's code name is Seiga.

Pairing: Natsume, saniwa code name Madara.

Theme: The fluffiest fluff is the best