Versatile Mage: Commander's Holiday Magic

After ending the endless war with the sirens, the commander finally got a rare and long vacation. In order to solve the problem of offspring between humans (suspected) and ship girls, the commander decided to temporarily put down the technology tree and come to the new world to seek the power of magic, so: What do you mean you summoned the Blue Eyes White Dragon? What do you mean your summoned beast is "Beautiful! Powerful! Immortal!" Harem [Supplement: This book is also called "Yes, Commander"]