Kei Nishima steps into his new life as a husband and stepfather after marrying Yui Kanade. Their home is calm, warm and welcoming. Yui’s seventeen-year-old daughter, Touko, greets him with perfect politeness, almost too perfect.

Kei tries to settle into the new family rhythm, but small things begin to feel off. Touko’s gaze lingers a bit too long. Her smile holds something he can’t read. The house feels different whenever she’s nearby, as if a quiet tension rests beneath the walls.

Nothing is outright wrong… yet nothing feels entirely right.

A gentle beginning.
A fragile balance.
A family carrying something unspoken.

And everything starts with one soft word from Touko:

“Papa.”