Hammer Maid!
Hammer and Mermaid!·はんまめいど！
Keiichi is afraid of water and cannot swim. After being taken to a fitness club, he develops feelings for a swimming instructor named Shizuku and resolves to overcome his fear to impress her. His progress is hindered by his ongoing fear of water, and he faces additional complications as several attractive women at the club show interest in him. The story follows his struggle to conquer his fear and pursue Shizuku.