Trinity seven, vol. 23: the seven magicians - Akinari Nao

A momentary peace has been spoiled by an intruder from heaven who tells Selina they're in need of her power.

As if that weren't enough, there are signs the most malevolent deity of all, the Goddess of Deep Darkness, may soon awaken! And when Arata finds himself on an unfamiliar island with a beautiful stranger who claims they've actually met many times before, what surprises lie in wait.