Ann Clements is terminally ill.

Born with an inoperable tumour in her temple, numerous doctors told her during her childhood that she wouldn’t survive into her adulthood.

Ann’s parents, regarding their frail and sickly young daughter as a hindrance, sent her away to a fancy all-girls’ boarding school, St Cecilia’s, located in the countryside at an early age to get rid of her.

Ann’s future looked like a bleak, desolate thing – but, by some miracle, she survived much longer than expected.

At the age of nineteen, Ann now works at St Cecilia’s as an assistant teacher, while having no plans, goals, or dreams. What can she hope to accomplish, after all, when her life might suddenly come to a close?

Ann’s job is fulfilling enough, but the monotony of her daily routine isn’t enough to satisfy her. As her twentieth birthday approaches, Ann’s desire to experience more of the world beyond St Cecilia’s walls increases…

And then Ann meets St Cecilia’s new nurse, Asaba Kohaku.

What will happen between the two women next...?