Astrophysics (ATHENA) telescope. Multiple space agencies, including NASA and the European Space Agency (ESA) are participating in the mission. In Japan, the project is led by JAXA's Institute of Space and Astronautical Science (ISAS) division, and U.S. participation is led by NASA's Goddard Space Flight Center (GSFC). The U.S. contribution is expected to cost around US$80 million, which is about the same amount as the contribution to Hitomi. Changes from Hitomi The X-ray Imaging and Spectroscopy Mission will be one of the first projects for ISAS to place a separate project manager (PM) and a primary investigator (PI). This measure was taken as part of ISAS's reform in project management to prevent the recurrence of the Hitomi accident. In traditional ISAS missions, the PM was also responsible for tasks that would typically be allocated to PI's in a NASA mission. A team of astronomers from GSFC suggests pairing the XRISM satellite with a source satellite containing radioactive sources. XRISM will observe the source sat to conduct absolute calibration of its telescopes, thus functioning as an in-orbit X-ray "standard candle". With its broad effective area, the telescope could potentially establish several standard candles in the sky by observing constant celestial sources. If this concept proves successful, later missions such as ATHENA and Lynx may have their own source sats. While Hitomi had an array of instruments spanning from soft X-ray to soft gamma ray, XRISM will focus around the Resolve instrument (equivalent to Hitomi SXS), as well as Xtend (SXI), which has a high affinity to Resolve. The elimination of a hard X-ray telescope is based on the launch of NASA's NuSTAR satellite, a development that was not put to consideration when the NeXT proposal was initially formulated. NuSTAR's spatial and energy resolution is analogous to Hitomi hard X-ray instruments. Once XRISM operation starts, collaborative observations with NuSTAR will likely be essential. Meanwhile, the scientific value of the soft and hard X-ray band width boundary has been noted; therefore the option of upgrading XRISM instruments to be partially capable of hard X-ray observation is under consideration. Furthermore, a hard X-ray telescope proposal with abilities surpassing Hitomi has also been proposed. The FORCE (Focusing On Relativistic universe and Cosmic Evolution) space telescope is a candidate for the next ISAS competitive medium class mission. If selected, FORCE is to be launched after the mid-2020s, with an eye towards conducting simultaneous observations with ATHENA.