Tetsuo's Crystal by Kaori Flores Yonekura.

2021. 26 pag. Spanish/English. Paper back and Kindle. ASIN : B08P3WYZ3X

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During the 1930s, when they left their parents' home, Emi and her brother Makoto each received half of a crystal that their father Tetsuo had obtained on Mount Kinpu.
Makoto joins the army that travels to Manchuria and Emi gets on a boat to go marry a stranger in Peru and then moves to Venezuela. That crystal becomes his connection to his home and family amid his experiences in unknown lands of Asia and America before, during and after World War II.