After Momoka Famisaki’s daughter moved out, it was just her and Ichiro — the story’s protagonist.

At first, life together felt ordinary enough. But little by little, Momoka began to change the atmosphere of the house: she teased him, crossed the line with shameless little acts, leaned in too close, and spoke to him in a playful yet indecent way — only to blush later when the weight of her own words and actions finally hit her.

Ichiro couldn’t shake the discomfort, nor did he know how to handle it.

Leaving Momoka isn’t an option — to abandon her after her only daughter moved away would be cruel, especially when she had once taken him in after he lost his parents and raised him as if he were her own.

And now, she had no one else in her life — only him.

As the days pass, their life together spirals into a string of unpredictable events, and Ichiro comes to realize that sharing a home with her is far more complicated than he ever imagined… and far more fascinating than he expected.

But here's the question: is Momoka really acting out of pure feelings — or there's something deeper, something far more troubling, pulling the strings?...