@Soleilsky It may be due to the constant warfare that the ship girls partake in. As shown, there would inevitably be many of their fellow ship girls sinking in these battles. The grief and guilt amongst other feelings from this would keep on accumulating with each passing battle and this may...
@YungMassah Nah bro this is a wholesome, in fact it's diabetic.
Novel sauce if you guys wanna read: https://foxaholic.com/novel/i-was-caught-up-in-a-hero-summoning-but-that-world-is-at-peace/
@karamella