One day in the middle of a record-breaking heatwave, three employees at the company her husband runs suddenly quit. Wanting to help out in any way she could, his wife Hikari starts helping with the accounting. Then, with her husband's encouragement, she starts learning how to use computers from her childhood friend Odagiri. Every Tuesday, when Odagiri is off work, she goes to his school and improves little by little. However, as her computer skills improve, the two of them grow closer. They know it's wrong, but they're conscious of each other and press their sweaty bodies together...