Do You Remember my Name?. UNWN

Hayato Ayumu, A 17 years-old student who suffered from his parent's abusive beating and developed a psychological disorder called schizoid.
With him rescued by the government from his parents at the age of 10, He lost his ability to express emotion and continued to live with it with his non-blood related sister.
On his way to home from school, he stumbled upon a letter in his path. Upon noticing it, he ignored it and continued to walk home.

It's night.

After Ayumu took a bath, he proceeded to enter his room to take a sleep. Upon opening the door, The same letter appeared again in front of him. The room shook, the door shut itself locking Ayumu inside his room and before he knows it, he's already in another world.

Meeting an unknown people in another world, Ayumu's situation began to change. Would he choose to stick with his old personality and ignore the society or would he rather socialized and begin his new life.