| Title |
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| Play time | Unknown | ||
| Developer | Vingt-et-un. Systems Corporation | ||
| Publishers | D3 Publisher | ||
| Links | Wikipedia (en), Wikipedia (ja), Wikidata | ||
| Shops | sponsored links» US$ 25.90 @ PlayAsia » US$ 51.99 @ PlayAsia | ||
DescriptionThis female-targeted love simulation puts players in the role of a high school student that one day gets warped to a separate world, becoming a mermaid along the way! Good thing she was a member of her school's swimming club! | |||
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| Hayami Rui速水 瞳O | |
| Aliases | Rui Mia, ルイ・ミーア |
| Measurements | Height: 158cm, Weight: 46kg |
| Birthday | 18 May |
| Age | 17 |
| Hair | Blond, Brown, Ponytail, Waist Length+ |
| Eyes | Blue, Hazel |
| Body | Teen |
| Personality | Watashi |
| Role | High School Student, Merperson, Nameable, Older Sister, Princess, School Swimming Club Member |
| Engages in | Dimensional Travel |
DescriptionA normal 2nd year high school student who is suddenly transported to another world 'Seabansfard' where she is a mermaid princess. | |
| Aoi Haruka蒼井 宙AB | |
| Aliases | Haruka Brau, ハルカ・ブラウ |
| Measurements | Height: 181cm, Weight: 65kg |
| Birthday | 23 January |
| Age | 35 |
| Hair | Black, Grey, Shoulder-length |
| Eyes | Blue, Brown |
| Body | Adult, Tall (obsolete) |
| Clothes | Glasses |
| Role | Prince, Teacher |
| Engages in | Smoking |
| Voiced by | Chiba Isshin |
DescriptionThe protagonist's homeroom teacher, his subject is math. | |
| Hayami Guren速水 紅蓮B | |
| Aliases | Grien Road, グリーエン・ロッド |
| Measurements | Height: 173cm, Weight: 58kg |
| Birthday | 12 August |
| Age | 16 |
| Hair | Blond, Brown, Short, Shoulder-length |
| Eyes | Blue, Brown |
| Body | Teen |
| Clothes | Cape, Earrings |
| Items | Sword |
| Personality | Smart |
| Role | High School Student, Kouhai, Prince, Younger Brother |
| Voiced by | Yusa Kouji |
DescriptionThe protagonist's one year younger brother. A first year high school student. A smart guy who is also good at sports. | |
| Rozenrite Meguruローゼンライト 運O | |
| Aliases | Meguru Reat, メグル・リーテ |
| Measurements | Height: 182cm, Weight: 68kg |
| Birthday | 20 July |
| Age | 21 |
| Hair | Blond, Cyan, Short |
| Eyes | Amber, Blue |
| Body | Olive, Tall (obsolete), Young-adult |
| Clothes | Choker, Sunglasses |
| Personality | Refined |
| Role | Childhood Friend, German, Half-Japanese, Prince, University Student |
| Voiced by | Onosaka Masaya |
DescriptionThe protagonist's childhood friend, a 3rd year university student. | |
| Sharltrue Schwartzシャルトリュー・ シュワルツェB | |
| Aliases | Sharl, シャル |
| Measurements | Height: 183cm, Weight: 68kg |
| Age | 18 |
| Hair | Black, Long |
| Eyes | Green |
| Body | Pale, Tall (obsolete), Teen |
| Clothes | Cape |
| Items | Sword |
| Personality | Kind |
| Role | Prince |
| Voiced by | Sakurai Takahiro |
DescriptionA prince of a country in the other world that is filled with fighting. | |
| Touya Dunkleトーヤ・ダンケルAB | |
| Measurements | Height: 171cm, Weight: 57kg |
| Age | 17 |
| Hair | Violet, Waist Length+ |
| Eyes | Grey |
| Body | Teen |
| Items | Sword |
| Personality | Atashi, Effeminate |
| Role | Prince |
| Voiced by | Matsuno Taiki |
DescriptionThe prince of a country in the other world that is plain and boring. | |
| Yukikusa Jun雪草 純A | |
| Aliases | Jun Vytes, ジュン・ヴァイツ |
| Measurements | Height: 175cm, Weight: 59kg |
| Birthday | 10 December |
| Age | 17 |
| Hair | Brown, Grey, Short, Waist Length+ |
| Eyes | Black, Heterochromia, Violet |
| Body | Teen |
| Role | Betrothed, Classmate, High School Student, Merperson, Prince, School Swimming Club Member |
| Voiced by | Morikubo Shoutarou |
DescriptionThe protagonist's classmate and fellow member of the swimming club. | |
| Yuuto Ayscuros Neatsユウト・アイスキュロス・ニーツ | |
| Hair | Brown, Short |
| Eyes | Red |
| Body | Kid, Younger Appearance |
| Items | Sword |
| Personality | Mysterious |
| Role | Prince |
| Voiced by | Toriumi Kousuke |
DescriptionPrince of a central country in the other world. | |