You can check this for further reference. All submarines except U-511/Ro-500 have nicknames based on kanji (i.e. number) readings.
Add to Nimu (I-23) this event new ones: "Hito mi" (I-13) and "I yo" (I-14).
Is Ro-chan giving it to the admiral too?Hehe-
Thanks-I want to give it to the admiral as well, but...Chocolate and... daifuku...! Shioi is amazing!Ehm... can you teach Ro-chan to make it too?I see! Then I'll have to teach you with a boom!Yes! Please do, Shioi-sensei!Okay ♪Hmm? It's raw chocolate daifuku.Shioi, what are you making?shyfidget fidgetI'm giving it to Decchi.I want to say, "Thank you as always!"I want to give a surprise.