@Zippy There's a novel.
https://www.mangaupdates.com/series/dt40lly/the-extra-s-academy-survival-guide-novel
https://www.mangaupdates.com/series/dt40lly/the-extra-s-academy-survival-guide-novel
The Galactic Navy Officer Becomes an Adventurer
by Takuma Tomomasa , A_Itoh
Available on mangabuddy for reading, and for sale at https://www.amazon.com/dp/B0BT6V7CMM
by Takuma Tomomasa , A_Itoh
Available on mangabuddy for reading, and for sale at https://www.amazon.com/dp/B0BT6V7CMM