1. I absolutely hate this Seta-kun, NO NTR or we riot!
2. The scene where Ebata is hugging Natsumi after entrusting her with a military secret is <chef's kiss> sweet.
The prelude to the WW2 was in full swing in Asia already in 1936. Perhaps it didn't affect the navy as much as the other braches, but you can bet they were busy as well, especially training and formulating better techniques and strategies.