Fifteen-year-old Mizuka finds a place among children without a place of their own in a closed amusement park and encounters friendship and first love. A friend's death and pregnancy force her to ask what it means to protect someone precious.

In a closed amusement park, children without a place touch one another's pain.

Okisai Toshizo, once tied to killing in Yoshiwara, becomes Yoemon in Kyoto's Shimabara quarter and faces troubles born from desire among men and women. The historical novel combines swordplay, feeling, and mystery in the pleasure district.

A man who has laid down the sword deftly handles troubles in the pleasure quarter.