Office lady Kotomi finds herself constantly overwhelmed with service overtime, making it nearly impossible to catch the last train home. To cope, she secretly indulges in daily fantasies of steamy office encounters with male coworkers—different scenarios each day. Her vivid imagination grows so intense that she sometimes catches herself unconsciously touching her pussy. One day, while deeply immersed in her fantasy and focused on work, her department chief quietly approaches her desk. The sudden tension and excitement escalate her arousal to new heights.