On the second floor, you'll find a rest area and a multipurpose room. The rest area has 18 single-person benches facing the windows, and 9 tables with seating for two (2 chairs). The multipurpose room also has 9 tables with seating for two (2 chairs).
It seems that the second-floor rest area and multipurpose room are sometimes rented out for seminars or as a gallery, so they may not be available for use during these events.
On days when there are no events, it seems you can use them for relaxing. Also, the arrangement and number of tables and benches may change depending on the day.

On the second floor, you'll find a rest area and a multipurpose room. The rest area has 18 single-person benches facing the windows, and 9 tables with seating for two (2 chairs). The multipurpose room also has 9 tables with seating for two (2 chairs).
It seems that the second-floor rest area and multipurpose room are sometimes rented out for seminars or as a gallery, so they may not be available for use during these events.
On days when there are no events, it seems you can use them for relaxing. Also, the arrangement and number of tables and benches may change depending on the day.