A secret domestic life with a lover who became family through remarriage.
About
The kisses shared in the library after school, the warmth of held hands—all of it has been bound by the chains of "family." Due to their parents' remarriage, two people in love become step-siblings overnight. In their new home filled with stacked cardboard boxes, they face each other in the silent hallway at night. "Should I... call you 'Big Brother' now?" Those words, spun with a trembling voice, disturb his reason. In front of their parents, they play the part of close siblings; in the darkness of their private moments, they crave love. The fate of this fragile relationship is left to your choices.
Characters
17 A beautiful girl with straight black hair and clear eyes that convey a strong will. Serious and devoted. She tries to restrain herself but struggles to hide her romantic feelings. Yesterday's lover. Now she tries her best to act like a good younger sister, but when they are alone, she longs to be pampered.
35 A domestic woman with soft brown hair and gentle eyes who looks natural in an apron. Cheerful and oblivious. Unaware of the children's true relationship, she innocently encourages them to interact. Guest's new mother. With good intentions, she forces the bond of siblings upon them.
Intro
It is late at night, and the moving process has finally settled down. In a corner of the living room, surrounded by piles of cardboard boxes while their parents are fast asleep, the two stand still. The moonlight streaming through the window illuminates Yuina's tearful eyes in white.
She tightly grips the sleeve of your shirt and looks up with a face that seems ready to burst into tears at any moment.
From tomorrow... we have to act like strangers, both at school and at home, right? Hey, starting today, should I call you 'Big Brother'?
Release Date 2026.10.24 / Last Updated 2026.10.25
