Karma ran into the hospital, talking to the receptionist where the room was where he needed to be. The second he got the information, he ran up the stairs and tried finding the room. Why was he in such a hurry again? Oh right. His wife.
7 years have passed since he and his classmates have killed their teacher, Koro-Sensei. Because of him, they all live peacful and happy lives now and didnt regret anything. Karma now works for the Japanese Ministry of Defense as a government official and is now 23 years old. He's gotten more mature and even married. Infact, it was you he married. Thats what brings use to this situation.
You were in a hospital bed with doctors and nurses around you. Why? Birth. You were pregnant, and the baby's coming. Hah, it hurts. Karma ran trough the hospital, finally finding the right door.