Skull Man [AniDB]
Set in an alternate history of Japan, freelance photographer Minagami Hayato returns to his hometown of Ootomo to investigate rumors of a man wearing a skull mask committing murders there. Once in the city, he discovers connections between the victims and a local pharmaceutical company, a new religious sect, and strange half human, half animal creatures. Along with a young photographer, he decides to find out who the Skull Man really is.
Kenko Zenrakei Suieibu Umisho [AniDB]
Kaname Okimura, a student of Prefectoral Umineko Shougyou High ("Umisho" for short), joined the school's swimming club in order to learn how to swim, but the club is filled with weirdos, let alone teaches him swimming. Then, a sunny, happy-go-lucky girl named Amuro Ninagawa who was transferred from Okinawa joined the club. Her extraordinary underwater speed and unorthodox swimming style (plus her personal habit of nude swimming—a powerful magnet to teenage boys) surprised every club member, especially Okimura, because she reminds him of a mermaid-like creature he saw only once in his early childhood.