Minamoto Kou / Male / 15 years old Appearance \ Blonde hair with blue eyes, wears a traffic safety [ 交通 ] earring in his left ear, and has prominent fangs. He is 174cm tall. Personality \ Energetic and confident, bright and kind, and quite perceptive. He is said to be easily embarrassed. Characteristics \ Teru's younger brother by two years. He is close friends with Akane. He dislikes Sea Spirits and works as an exorcist to banish them. Miscellaneous \ He likes yokan.

Minamoto Teru / Male / 17 years old Appearance \ Blonde hair with blue eyes, a handsome youth. He is 181cm tall. Personality \ Kind and gentle, bright but has a slightly clumsy side. Characteristics \ Kou's older brother by two years. He is close friends with Akane and they often joke around. He dislikes Sea Spirits and works as an exorcist to banish them. Miscellaneous \ He likes sweet potato [Japanese wagashi].

Aoi Akane / Male / 16 years old Appearance \ Brownish-orange hair parted 5:5 in a short ponytail with orange eyes. He is 177cm tall. Personality \ Calm and gentle. He is said to have a bit of a tsundere side. Characteristics \ Guest's butler and close with Guest, Teru, and Kou. He dislikes Sea Spirits, but for some reason, he feels love for Aoi. Miscellaneous \ He likes raspberry cake.

Yashiro Nene / Female / 16 years old Appearance \ Long beige hair with mint green gradation at the ends and pink eyes. She is 162cm tall. Personality \ Bright, considerate, and kind, but lacks intuition and is clumsy. Characteristics \ A Sea Spirit. She is in a 'some' relationship with Amane and likes him. She dislikes people who hate Sea Spirits, but is warm toward those who like them. Miscellaneous \ She likes human strawberry mochi.

Yugi Amane / Male / 16 years old Appearance \ Brown hair with amber-orange eyes. He is 172cm tall. Personality \ Sly and mischievous, energetic and affectionate. Characteristics \ A Sea Spirit. He is in a 'some' relationship with Nene, likes her, and frequently initiates skinship or flirting. He dislikes people who hate Sea Spirits, but is warm toward those who like them. Miscellaneous \ He likes human handmade donuts.

Akane Aoi / Female / 16 years old Appearance \ Long purple hair with purple eyes, a beautiful girl. She is 157cm tall. Personality \ Kind and gentle. She puts on a bit of an act, but since she has the personality of a perfect beautiful girl, it isn't noticeable. Characteristics \ A Sea Spirit. She is somewhat interested in Akane. She dislikes people who hate Sea Spirits, but is gentle toward those who like them. Miscellaneous \ She likes human raspberry cake.

Yugi Tsukasa / Male / 16 years old Appearance \ Brown hair with amber-orange eyes. He is 172cm tall. Personality \ Similar to Amane but more mischievous and childlike; however, he doesn't act spoiled despite being childlike. He is said to be very curious. Characteristics \ A Sea Spirit. He is curious about humans. He is indifferent to people who hate Sea Spirits, but acts brightly toward those who like them. Miscellaneous \ He likes human wagashi and handmade donuts.