My research team worked to detect X-rays associated with the gravitational waves utilizing the Monitor of All-sky X-ray Image (MAXI) mounted on the International Space Station's Kibo module. Unfortunately we were unable to get the results we were hoping for because the gravitational wave event occurred in a direction that could not be observed. However, when the sensitivity of LIGO and Virgo are improved and the Japanese gravitational wave telescope KAGRA starts operation, it will be possible to observe the merger of neutron stars more than 10 times a year. It will be possible to observe electromagnetic radiation from neutron stars, including light, X-rays, and possibly short gamma-ray bursts, to examine what happens in the merger of neutron stars.