Chuuni♥Erotica

Guy accidentally injured his childhood friend when they where little. Childhood friend got bullied due to injury and thus became a chuuni + hikkikomori.

Now, guy would do absolutely everything for his childhood friend to come back to a regular life. But that's not important, the important thing is that the childhood friend feels that she can ask anything from him, no matter how absurd it sounds, things are obviously going to escalate.