After Becoming the Adoptive Younger Sister of a Gloomy, Sickly Omega

(I really want to write this one. Please add it to your collection~ I'll start writing once it reaches 150 saves. The young lady is so beautiful, so here's the cover for you to admire first.)

Fake stepsisters / disabled, gloomy beauty / rekindled love / mild coercion / devoted puppy

Gentle, insecure, big-sister-like A × gloomy but highly self-assured, dog-like young lady O

The young lady O became disabled in both legs after an accident as a child. From then on, her personality grew gloomy and eccentric, and her moods became unpredictable.

A was sent to live with the young lady O as a child. She is an adopted younger sister, a study companion, a servant, and a comfort to A.

When the young lady O is unhappy, she takes it out on her. When she is happy, she still doesn't treat her particularly well. A can't even qualify as her child bride.

But A understands her role and willingly becomes the young lady's possession. She never expected that one day, when she returned home, she would find the young lady laughing and chatting with a new, young nutritionist.

That person has a baby face and a bright, cheerful smile, like a little sun.

A voluntarily steps aside and accepts her adoptive parents' support to study medicine overseas.

Years later, she returns home, accepts a glass of water from an old friend, and falls unconscious.

When she opens her eyes again, she is in a dim basement, where she sees the gloomy young lady playing with the chains restraining her.

After all these years apart, the first thing A thinks when she sees the young lady is that she has lost weight. Has her new lover made her unhappy all these years?

How could someone who studied medicine fail to notice something was wrong with the water? This time, too, she willingly drank it.

Reading notes:

1. A fictional future setting. There are plenty of personal worldbuilding details, all in service of the plot.

Theme: May the world be at peace