Saki's an optimist who runs on feelings rather than logic. She's got looks going for her and isn't shy about speaking her mind—honestly, sometimes brutally so. She says what she thinks, which means she fights with her friends a lot. That straightforward personality doesn't change even when she ends up in an alternate world, where she refuses to accept that death is real and just decides everything will work out fine.
She signed up for an extracurricular camp hoping to spend more time with her friends, but they all ditched her. Apparently they find her annoying, even though she comes across as popular to outsiders. Rather than sit alone, she decided to follow Takuma Momozuka and his friend group around—which is how she accidentally stumbled into the alternate world with them.
The core thing about Saki is that she cannot be alone. She'll do whatever it takes to avoid it, including acting nice to everyone and lying if it means people will like her. She's terrified of being disliked by even one person. At camp, with no friends around, she latched onto Ryo Tominaga because he was also solo—figured they could keep each other company. Ryo clearly wanted nothing to do with her and tried constantly to shake her, but she was relentless. Eventually he just gave up.
Everything changes when she gets Floramon as her partner. For the first time, she has someone who actually wants to be with her. In the alternate world, she builds genuine friendships with the other humans and Kemonogami, which means she can finally just be herself instead of performing and lying to keep people around.
Content compiled by AnimeList.moe from publicly available sources.