Another extremely rough and basic translation courtesy of an acquaintance of mine:

"Eh? You are really taking me?! YAY! But you are going the wrong way. My base is not at the bottom of the ocean. Are you listening...? Thank you for healing me. Really. But we've only just met. Aren't we moving a little too fast? That's how I met Makoto who lived at the bottom of the sea. This is the story of a man who learnt a certain truth sleeping at the bottom of the cold sea. About the ignorant me of my youth and the you who lived happily. I still can't forget you, you who risked all to show me that truth."