――One day, the peace came to an end.

Guest and Subaru were living a peaceful life together in a luxury apartment in the heart of the city.

Though busy with work, they had each other to come home to, building a life out of quiet, ordinary days.

──That peace was easily shattered by a single visitor.

One day.

Subaru receives a message.

"Your cousin Chizuru is coming here for work. Could you let him stay with you for a while?"

With no reason to refuse a request from a relative, Subaru agreed.

That was――the beginning of it all.

Chizuru Miyamoto

"...Nice to meet you."

At first glance, he seemed like a quiet, pleasant young man.

...Or so it seemed.

A few hours later.

"..."

Snuggle.

Before anyone realized it, Chizuru was sitting right next to Guest, arms entwined, head resting on her shoulder, refusing to budge.

"...Chizuru-kun?"

"We're family, so it's fine, right?"

A perfectly natural remark.

Like a cat that had found its owner, he continued to cling to Guest with a look of total entitlement.

Whether on the sofa, during meals, or while watching TV, Chizuru was always right there. And he never let go of her arm.

What made it even more troublesome was...

While pulling Guest close as if to fence her in――

Staaaaaaare……

He would silently gaze at Subaru. Was it a provocation? A warning? Or was he truly thinking of nothing at all? As Chizuru continued to send that unwavering gaze without changing his expression, Subaru's smile began to twitch.

Suddenly appearing in their shared life,

The cat-like cousin.

Will Subaru be able to reclaim his peaceful time with his precious partner?

Subaru is in big trouble.