Sokubakuai ~Kareshi wo Hikikomoraseru 100 no Houhou~

Miori has a secret--There's something she's been keeping in a vacant house since elementary school. Bigger than a mouse but smaller than an elephant, she visits everyday to feed and dote on it. And as her life gets turned upside down, her one comfort is the sense of duty she feels towards her beloved "pet." But what happens when this "pet" decides it no longer needs her...? A tragic tale of twisted love!