Interdisciplinary Theoretical & Mathematical Science Program (iTHEMS) is a program for making dreams of scientists and human beings come true. We, iTHEMS, will try to solve scientific fundamental questions such as origin of the universe & life. We, iTHEMS, will try to solve fundamental questions of human beings such as shortage of food & energy, as well as social security. For that purpose, we will realize interdisciplinary sciences among mathematics, natural sciences, and computational science. For that purpose, high ambition & strong determination that will last for a long time with perspective for the world 50-100 years later are indispensable. Free atmosphere among scientists is also necessary for fully successful interdisciplinary sciences. I, as an astrophysicist, would like to tell iTHEMS members continuously how interesting astrophysics & cosmology are. I would like to ask iTHEMS members continuously like a child about what I don’t know and what I don’t understand. iTHEMS is also a program where scientists can be back to children once more.