Maricha is a pet.
Anon is a normal salary man, and a pet keeper (a bad one).
One day he forgot to close the door, so Maricha wandered around his house (not so sure about the "wander" part, maybe she's running away from anon, like the title).
Throughout her journey, she encountered some dangerous things (broken glass, cup of coffee, fallen books, food not for yukkuri), yet due to her luck she's still alive. At last, she went to anon's bedroom and slept on his bed, under the blanket, anon, not notice his pet's missing, plan to sleep on the bed, but luckily (again) that he heard her snore and woke her up.
After that, somehow he forgot again and this time, she got stuck in a tangled earphone. Unluckily, she could not escape and the rest is history.
