Is episode 4 confirmation that Yuzuriha is simply decoration and hostage material? We get a hot springs scene where Taiju puts off confessing, again, proving that he hasn’t learned anything from delaying last time. We see her being protected by Taiju when the gunpowder goes boom. Then she literally gets taken hostage by Tsukasa. I have to say that Dr Stone isn’t doing a great job making her an actual character so far and that’s actually pretty disappointing.

Source: Dr Stone Review Episode 4 – 100 Word Anime