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Masanari was a son of [[Hayashi Masahide]], and his mother was of the Andô clan. He married his second wife, Fuku (later to be known as [[Kasuga no Tsubone]]) in [[1595]], after the death of his first wife, a daughter of [[Saito Toshimitsu]], and older sister to Fuku. He was first a vassal of [[Toyotomi Hideyoshi]], and after his death, he became a vassal and advisor to [[Kobayakawa Hideaki]]. Before the [[Battle of Sekigahara]] he counceled Hideaki to defect to the Eastern army, led by [[Tokugawa Ieyasu]]<ref>It is possible that his wife Fuku, who must have hated Hideyoshi for the murder of her father, may have had a hand in convincing Masanari to advise Hideaki to turn against the Eastern army, which represented Hideyoshi</ref>.  On the night before the battle, [[Otani Yoshitsugu|Ôtani Yoshitsugu]] met with Masanari and Hideaki, and, perhaps to keep up appearances, the former gave his word to Yoshitsugu that Masanari would fight on the side of the Western army.  During the battle, Hideaki did indeed defect to the Tokugawa side, possibly winning the battle for Ieyasu.

Masanari was a son of [[Hayashi Masahide]], and his mother was of the Andô clan. He married his second wife, Fuku (later to be known as [[Kasuga no Tsubone]]) in [[1595]], after the death of his first wife, a daughter of [[Saito Toshimitsu|Saitô Toshimitsu]], and older sister to Fuku. He was first a vassal of [[Toyotomi Hideyoshi]], and after his death, he became a vassal and advisor to [[Kobayakawa Hideaki]]. Before the [[Battle of Sekigahara]] he counceled Hideaki to defect to the Eastern army, led by [[Tokugawa Ieyasu]]<ref>It is possible that his wife Fuku, who must have hated Hideyoshi for the murder of her father, may have had a hand in convincing Masanari to advise Hideaki to turn against the Eastern army, which represented Hideyoshi</ref>.  On the night before the battle, [[Otani Yoshitsugu|Ôtani Yoshitsugu]] met with Masanari and Hideaki, and, perhaps to keep up appearances, the former gave his word to Yoshitsugu that Masanari would fight on the side of the Western army.  During the battle, Hideaki did indeed defect to the Tokugawa side, possibly winning the battle for Ieyasu.

Shortly before Hideaki's death in 1602, Masanari left the service of his lord and retired to Mino province,<ref>Some sources state that he was forced into retirement by the death of his lord</ref> possibly in order to escape any "responsibility" for Hideaki's treason at Sekigahara.

Shortly before Hideaki's death in 1602, Masanari left the service of his lord and retired to Mino province,<ref>Some sources state that he was forced into retirement by the death of his lord</ref> possibly in order to escape any "responsibility" for Hideaki's treason at Sekigahara.