During the battle of Sekigahara the Tachibana family became allies of the western army which was defeated and as such, Masutoki was requested by Nagamasa KURODA (lord of Chikuzen Province) to serve him in the same way and he became a steward to the 30,000 koku Akizuki Domain.
立花家は関ヶ原の戦いに西軍に味方して敗れたため、増時は筑前国主となった黒田長政の懇望に応じ、一類と共に仕え、秋月藩3万石の執事となる。