Itoshi wo Tome - Kimi ga Kokoro wa

A tale of love set in the feudal times! A tale of a tomboy daughter of a high ranking official and her love with her special other, who she was sworn to take care of and protect. Tachibana-hime and her precious Sakura must persevere through the harsh lifestyle of nobility, and many challenges await them that could forcefully tear them apart... will Tachibana's undying love for Sakura be enough to protect her?

(Source: Tsundere Translations)