Haruto Kiryuu thought love was supposed to be simple—until the night everything changed.
When his childhood friend, Himari, confesses that she broke up with his best friend because of him, Haruto is thrown into a whirlwind of emotions. But before he can even process it, fate delivers another cruel twist—his father suddenly remarries, and his new step-sister is none other than… Himari.
What was once a hidden attraction turns into a forbidden temptation. Living under the same roof, stolen glances turn into lingering touches, and suppressed feelings threaten to explode. But as their dangerous relationship deepens, secrets from the past begin to unravel, and the lines between love and betrayal blur.
Can they keep their forbidden love a secret? Or will their sinful bond shatter the lives of everyone around them?
A story of passion, heartbreak, and the price of love—welcome to Our Secret, Our Sin
