Series by 海底囚人

Sea witch Wadanohara returns to her underwater home with familiars Memoca, Dolphi, and Fukami. The Sea Kingdom faces conflict with the neighboring Totsusa Kingdom. She is asked to help protect the kingdom and repair the magical barriers that guard it. Her former familiar Samekichi appears and warns her to leave the sea. She tries to defend her home while also understanding why someone from her past opposes her return.