Ok so this is an idea for a future chapter. You don’t have to use it if you don’t want too but I just wanted to tell u about it.
So 3-E and the teachers (-koro- sensei of course) go to like a place that has a shooting range, laser tag, bowling, an arcade etc, etc. Anyways for someone in 3-5’s birthday they end up going to that place and like seee Nagisa with 3-e.
Sorry if that didn’t make since.
Here is another idea.
Ok so the same place but the sniper dou invite Nagisa the shooting range. 3-5 ends up going bowling (the bowling is right next to the shooting range) and see Nagisa and the sniper dou.