Sakunoshin is a displaced samurai from Japan's Tenshō era, who ended up in the Holy Era due to Natsuki's power surges that unbeknownst to her have been opening up temporary time portals in various parts of the city. When he first arrives, he mistakes Sakura for his love, ninja Kasumi. Later, when he realizes that Sakura is not Kasumi, he falls in love with her. It is revealed in the anime that Kasumi may be Sakura's direct ancestor. For some reason their wedding is never shown or discussed in the series, just one day Sakura gives birth to their triplets. Sakunoshin is very calm and even tempered, though in battle he becomes extremely fierce and deadly, and is able to best even experienced monster fighters. He has an entire kit of samurai armor, along with his katana, equipment, and a set of Japanese smoking pipes (only seen in the manga). In the manga, Sakunoshin is often apprehensive of his wife's romantic advances, as they humorously leave him extremely exhausted. Still, he loves her very much and sets out on an epic journey in search of a cure when Sakura is affected by magic weapons in later issues. Being human, he and his family are awarded food, clothing and housing from the government.

Sakunoshin is a very skilled swordsman and to her horror, has even sliced through Natsuki's orihalcon Blade.

(Source: Wikipedia)