Thanks for the translation!
Also i must know...this is pretty old, i just need to know, does someone know if the brother and the sister do end up together? like i am just curious, i thought the story was going that way when the sister became jealous of the ex-classmate/Teacher, and like i cant tell where this is going, and at this point i am more curious if the story is trying to go for the incest route or set him up with airi