Description

Soon after getting married, Wakura Mayuko's husband was murdered by an assassin.
Mayuko lost all hope and tried to kill herself, but there was a young boy who pulled her heart away from the grief. His name is Kaga Isamu. Like Mayuko, his parents also lost their lives to an assassin.
They hit it off so well that Mayuko adopted Isamu from the orphanage and brought him home.

Since then, ten years have passed, and Isamu is now a young man. While her husband's younger brother, the psychiatrist Wakura Takafumi, helped Mayuko find her way back to herself. Yet, as she recovers, she experiences growing pains as precious memories of her late husband gradually disappear.

One day, Isamu met a beautiful girl at a shrine.
Isamu is shocked by the girl's words,
"Mayuko will die soon."
When her heart is filled with emptiness, death will invite her soul.
The girl claims she knows how to save Mayuko and is willing to lend her hand, but the way to rescue Mayuko is to have the girl teach him "the way of sex".

[Translated from Official Website]