I Stayed in the Sea for Five Hundred Years Because I Was Afraid of Pain.

After an accidental death, he traveled to another world and studied in the sea for five hundred years because he was afraid of pain. A very conventional light novel about traveling through another world, it should be similar to fighting a 300-year-old slime. The heroine is invincible. Hi, please click the upper right corner if you don't like it Intention: Never give up at any time