い, さ, う
You need to take a body measurement before you can shoot. Whether it's for a photo shoot, you're gonna shoot them with a gun, or if you're about to shoot them full of radiation for X-rays, you need the right measurements of that body first.
This shoot is being done by a shaman (しゃ). Not only is he doing the body measurements for the shoot, but he's also going to be shooting you with a shot so you don't get the flu.
Currently there are no similar looking kanji which exist in the WaniKani learning system