Aqua

アクア

Aqua
Aquaアクア 
Hair, Black, Long, Twin Tails
Eyes, Garnet
Body, Short, Slim, Teen
Clothes, Dress, Gothic, Halterneck Dress, Ribbon Hair Tie, Ribbon Tie, Shrug, Thigh-high Stockings
Personality, Atashi, Jealous, Lazy, Loner, Low Self-esteem, Mysterious, Protective, Reserved, Sharp-tongued
Role, Clone, Cousin, Lonely, Older Sister, Pet Owner, Runaway, Superhuman
Engages in, Drinking, Escape From Confinement, Fighting, Flirting, Investigation, Medication, Murder, Sarcasm, Teasing, Unarmed Fighting, Vomiting
Subject of, Accident, Grief, Memory Alteration, Mental Affliction, Other Route Death, Pregnancy, Pregnancy Loss, Sexual Harassment, Turndown, Viral Infection
Visual novelsProtagonist - Himawari
Protagonist - Himawari Aqua After - The Day the Moon Stood Still
Voiced byTamura Yukari

Description

A girl of many secrets who keeps showing up around Youichi. She too bears the same name as one of the twelve zodiac signs. She acts in a mysterious way, alluding to certain things without revealing key details. However, it appears she knows Aries somehow...
Aqua is distant and aloof around others, unaware of the fact that her facial expression often betrays her true feelings.

“It’s because I’m a failure.”

[From MangaGamer]

Aqua is the protagonist of the 2048 story.