Cuckolded younger sister Chika ~My tsundere sister gets cuckolded without my knowledge~ (d338561)

A place in modern Japan.
Brother and sister living peacefully and without any inconvenience.
Kazuki Matsumoto and Chika Matsumoto
Her mother died when she was young,
My father works in a place far from here because he is a transferee.
The two of them live together normally.
Chika loves Kazuki, but
She always gets angry at Kazuki.
Chika wants to fix herself,
She was living her days even as she thought about it.
One day after school, Chika goes to pick up Kazuki so that she can go home with him.
However, she witnesses Kazuki being called to the back of her school building by a girl in her class.
She secretly followed her,
She ends up witnessing Kazuki confessing to his girl.
Fortunately, Kazuki seems to have refused the girl’s confession, but
If she continues to live like this,
My sister is taken by another woman! ?
Chika thought, and she immediately took action.
At night, she confesses her feelings to Kazuki and approaches Chika.
She is swept away and Kazuki accepts her as is.
Kazuki accepts Chika, but
It’s not good for her to continue dating Chika and let herself be carried away like this.
She thinks so and tells Chika that she wants to wait a little while before dating her.
She reconsidered her feelings with Chika,
Kazuki is determined to find an answer for his girlfriend Chika by her birthday.
She says that Chika is waiting for her, but…
I left her with an unsatisfied attitude,
Meanwhile, other men approach Chika.
Will Kazuki and Chika be able to be reunited safely?

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