RIKEN, Japan’s largest research institution, Mitsui Bussan Aerospace, and Kongsberg NanoAvionics announced on the 7th of August their collaboration on the NinjaSat1 X-ray observation mission. The aim of this two-year mission in low Earth orbit (LEO) is to observe X-ray photons from bright X-ray objects in the universe. The NinjaSat team intends to observe black holes and neutron stars that brighten suddenly in X-rays and coordinate with on-ground optical observatories to study how matter accretes to these compact objects.