18+ Isekai de Aisare Hime ni Nattara Genjitsu ga Kawarihajimemashita

The isolated office lady, Nanoka Kuroe's only moral support is spending time at the emergency stairs with her department manager, Renji Wagu. The night Wagu accidentally finds out about her feelings, she somehow ends up dreaming about him approaching her...?!

(Source: Takeshobo, translated)