Responses
You can see a frame here that shows them leaving : http://www.mangago.zone/read-manga/mawaru_sekai_no_kimi_to_boku/uu/mawaru_sekai_no_kimi_to_boku-chapter-1/42/
You can even see tomo saying 'go home' and keito's friend answering 'yup,yup'.
They left to leave the two lovers some alone time so don't worry about it (⌒▽⌒)
Well i don't. See his bodyguard leaving...hmm...*wink* *wink*ლ(´ڡ`ლ)
Ermm....am I the only one that noticed the part when the couple made out and have smex...the two friends never actually left? I can't help but think about the fact that those two bystanders are just there the whole time..WATCHING.. (╯°Д °)╯╧╧