I don't know how either of mine would know him, but I would be happy for something! Or just straight out new CR.

Valerian doesn't have experience with technology at all and he's never allowed out of the shrine much (except recently for school) so he probably hasn't been able to scam him. He could try not tho?? I guess? His friends are protective tho.

Since he's older than Kasa, they probably wouldn't have known each other in school either. Unless he's visited the shrine before (in which case, Tsukasa is there to 'listen to prayers' and bless others. People donate lots to the shrine for a 'blessing' from him =')