Harukanaru Toki No Naka De 4 [Treasure Box]

The heroine Ashihara Chihiro is a normal high school girl until one day a mysterious man informed her that she is a princess from Toyoashira. Following this alarming piece of news, a battle with a monster ensues where she discovers her powers as well as that of her teacher and best friend. More discoveries about her past and her fallen country are made when she wakes up in the world she fled from when she was a child. After battles against monsters she realized her role in this calamity as "Ryuujin no Miko" and that to revive her country, she has to go to war with the enemy nation that has invaded hers in the first place. During her adventures, she met up with a number of charismatic men, starting with her teacher and her best friend. But as a princess, falling for these men is prohibited. Together with the troubles that romance brings, Chihiro has to face the final battle with her bow and arrow as her only true ally.