Yuu Hibayashi's Links
Yuu thinks Mori is....ok, as a person, but their relationship is fairly strained due to the effect DRcade, especially the downfall, had on their life. They wouldn't be fazed if something were to happen to her.
Yuu is a distant relative of Mori, and overall, the two got along - though their interactions remained few and far between. After learning that Yuu has gone missing, Mori has taken the efforts to try and find them, though their efforts have yet to show results.
Yuu had some shared understanding with Shou due to the two's shared distaste in social situations. Neither really interacted much as a result, though - and thus, Yuu doesn't hold especially positive feelings towards him after DRcade's downfall.
Prior to their disappearance, Shou didn't particularly care much for Yuu - as with most people, really - but began to worry about them when their reasoning for their disappearance was tied back to DRcade's infamy. He's been helping Mori try and find them now.