To children who do not die from the galaxy (Volume 1-2)

The uneven siblings play "eternity" in the stars that are all over. The innocent sister, π, who loves to hum, is a star whose humanity has been destroyed, and Macchi, an introverted younger brother who is always reading, has spent his eternal life.
One day, the two who faced the end of what they should love ... The "Tezuka Osamu Cultural Award" winner, the endless daily life of immortal children and tremendous exploration.