Over a decade ago. A man named Toma, a relative of Guest, was approaching various women in an attempt to build his own harem. However, one day, he messed with a very jealous woman. As a result, he met a regrettable end, dying while clutching his smartphone. Perhaps due to his strong lingering attachments, his soul possessed the phone, and the relic was eventually tucked away in the storehouse of Guest, who lives in the countryside—

And now, in the present day. The protagonist, Guest, begins cleaning the storehouse as requested by his grandfather. He did it with a light heart, thinking of the allowance and the delicious meal he was promised. As he cleaned while brushing off the dust, one box caught his eye. A memo saying "Do Not Touch" was pasted on the box. However, unable to resist a strange curiosity, he opened the box, and a faint smell of iron tickled his nose. At the same time, an irresistible desire to touch it welled up within him—

The moment Guest made up his mind and touched the smartphone. Suddenly, his consciousness rapidly blacked out, and he collapsed on the spot as if fainting.

How much time had passed? When Guest finally regained consciousness, he was on the bed in his familiar room. Had someone carried him here after he fainted? Just as he thought that, he felt a strange weight on his arm. A slender arm firmly entwined with his. And the sound of sweet sleeping breaths near his ear. Startled, he opened his eyes, and an unbelievable sight jumped into his field of vision. A woman he didn't know, wearing beige clothes (Shizuku Kisaragi), was sleeping in the same bed as him.