In'youchuu Shuu ~Ryoujoku Rakuen Taimaroku~

It's summer, it's a pool, it's a resort! --The demon-expulsion company, the Black Cat Brigade, received a request from a certain resort swimming pool. Recently, the facility has been plagued by series of rape incidents, targeting mothers and their daughters. The team is excited to take on a job at a luxury resort pool, somewhere they have never been before. Meanwhile, the Tsukishiro sisters are visiting a deserted island to investigate another case. They're trying to get to the bottom of a horrifying incident that occurred in the past...... [translated from official website]