On a business trip, he ends up sharing a room with a female co-worker at a hot spring inn! He ends up in a mixed bath! And he gets turned on! Due to a mistake at the hot spring inn he visited on a business trip, he ends up sharing a room with a female co-worker! And the hot spring only has mixed baths! A series of unexpected happenings lead to him suddenly seeing the body of a female co-worker with unexpectedly large breasts, which makes him get a full erection!