Office ladies in their 30s, tired from work and romance, go on a solo trip to a hot spring as a reward to themselves. However, the devilish manager who is waiting for such prey has his poisonous fangs and attacks their voluptuous breasts! A G-cup major bank employee, an F-cup information management company employee, an I-cup major supermarket employee, an I-cup construction company employee... they all go on a solo trip to a hot spring, where their huge breasts spilling out of their unbuttoned yukatas are fondled!