Isekai no Seijou-sama ni Narimashita: Ikemen Daishinkan to Torokyun Shiawase Dekiai Seikatsu

Saku is an office lady who is tired of working overtime every day, loves movies, and longs for better days. When her boyfriend Sora, an unsuccessful band member, sings an incantation to her, she finds herself waking up in an unfamiliar canopy bed! Saku's body heats up after drinking the water given to her by an attendant, and that was when a handsome exotic-looking man, Saku's ideal type, appears and pushes her down! Saku concludes that this is just a dream after working too much overtime, so she boldly embraces the handsome man and let him ravish her.

The next day, she thought that she would wake up and be back to her normal routine, but... she's still in the same strange place as yesterday. Saku finds out that what happened yesterday was not a dream, but that she has actually been transported to another world....

(Source: a la mode, translated)