IZUMO (Izumo) Four volumes Hisui no Seduction!

Hikaru and his friends succeed in releasing the Blue Dragon, one of the Four Sacred Beasts... Their joy is short-lived, but the group is dragged into the darkness, where they are at the mercy of Tsukuyomi's illusions.What Ayaka sees in the darkness... , it was a forbidden past that she should have sealed away in the depths of her memory. Ayaka is sexually tortured by her stepfather and reaches her mental limit. The line between reality and illusion becomes blurred, and he begins to lose himself, but the person who cuts through the darkness and appears is none other than Hikaru...