FL got isekai'd to another world by her boyfriend and when she woke up, she's suddenly in a world where her holy ecstacy is needed to power up the barrier that protects the city.
I don't know. The lore's there but the execution of the story is done poorly. We have sexy characters but even the smut is lacking.
Isekai no Seijo-sama ni narimashita - Ikemen Dai Shinkan to Torokyun Shiawase Dekiai Seikatsu