Hashimoto is always getting scolded by his boss, Yuna. One day, he goes on a business trip with Yuna. However, due to the sudden business trip, only one hotel room was available, and Yuna and Hashimoto end up sharing a room. Hashimoto is usually Kokoro of Yuna, but she is a beautiful career woman who is well-known in the company. Hearing this story, Yamazaki, seeing the sudden change in Yuna's attitude towards Hashimoto, plots to spend the night with Yuna as well.