Sorry for This House!
The anon narrator explained that since he had been feeling lonely as he was living alone, he had taken in a marisa yukkuri (whether it was a stray or a pet wasn't mentioned in the story as far as I can tell). As anon lived alone in a big house, he gave the marisa the basement for her room. It had no windows and sparse furnishings, so marisa be injured accidentally. Anon kept marisa in that room since roaming outside would be dangerous. Other than that, anon provided marisa with all the food she needs, but because of work anon usually left marisa inside, not letting her wander around upstairs.
As anon was busy with work, he has little time to spend with marisa. Asking advice from some friends online, one of them suggested that since the room might be too big for marisa. Anon then gave to marisa the cardboard boxes used to move into the house, for marisa to use as building material for a nest. At first, marisa was grateful, but soon enough she asked to go outside, abandoning her attempt to build a nest.
Another friend suggested giving marisa some toys to amuse herself and not be bored. Anon drew on memories of his favorite toys in his childhood, so he gave marisa some rope and a tire to build a swing with. At first, marisa was grateful and played with the rope and tire, but soon enough she stopped playing, and ask again to go outside.
Two months later, marisa died. Days before she expired, she spend her time bashing herself on the walls repeatedly, ignoring everything else and spraying bean paste everywhere. Anon was left wondering what went wrong, and concluded that the house was not a good place to keep yukkuri in.
Illustration: post #37688