Well, I think the main reason why they are not surprised by Riku's ability of seeing the ghost lady is because Riku has been staying at hospital when he was still small. So you can basically say that he almost died with his sickness. I think that's why they are not surprised with Riku being able to see the ghost lady especially Tenn.
I honestly wished that they’d show more reaction of the fact that Riku can speak to ghosts. Heck, it’d be way funnier if the others were all freaking out and only Riku and Tenn are chill about it. They’ll are be staring at the open ‘secret’ twins.
i wish they gave more about how riku can talk to ghost, also im surprised tamaki didnt freak out when he kinda saw riku talk to ghosts, i expected a bigger reaction from them when they saw riku talking to ghosts, especially sogo and ryu
Uwahhh I'm happy that TROYCA animated this scene (the part when Riku can interact/see ghost) Personally, I'm sure ghost would be confused to see Sogo whether he's a ghost or human 😂