Would be great to find a collection of multiple first person accounts with some context. Documentary or book or whatever
Have you already checked Thomas Conlan, In Little Need of Divine Intervention:
Takezaki Suenaga’s Scrolls o f the Mongol Invasions of Japan.
Translation with Interpretive Essay, Ithaca: Cornell UP, 2001?
(The following link is a review of the book by Prof. Haruko Wakabayashi).
It includes the full translation of the narrative originally attached to famous Takezaki Suenaga's Scrolls of the Mongol Invasions of Japan (linked to the interactive edition, convenient to see the images), with some other relevant primary documents and editor's essays.