I loved When We Collided! I randomly picked it up at the library because the cover caught my eye, and I am so glad I did. It's been a while since I've really, truly loved a book the way I loved When We Collided. The Hate U Give is probably the closest, at least of the books I've read, but otherwise it's been quite a while since I've felt so excited and emotional about a book. 
 Vivi is bipolar, but at first, she's very much this vibrant, colorful person. It is isn't until later on that we learn she's bipolar and not taking her medication for a good portion of the book. Even though I'm not bipolar, I have struggled with depression, and I found it was so easy to relate to Vivi. I loved her as a character, and she is this bright, vivid character, and she, in this book, was a living, breathing person. I feel like I don't say that very often about characters. 
 As a book about a girl who is bipolar, this is an amazing book. Emery Lord did an amazing job at capturing every single thought and emotion Vivi had, and there were times where I really felt like I knew what Vivi was experiencing and dealing with. She is over-the-top and difficult and annoying, but I still felt for her. You really see Vivi's state of mind when she is and isn't on medication, her illness isn't manipulative at all, and I loved the way Vivi described things. 
 I think Vivi's half of the book- which was so vibrant and full of life- made Jonah's half a little bit hard. His chapters were more dull by comparison, mostly because anyone would look dull and lifeless and lackluster next to Vivi. He was compelling, to a degree, but not the way that Vivi's chapters were compelling. 
 His story felt more tired somehow- he's an older brother, taking care of his younger sibling after the unexpected death of his father, and a mother who has checked out emotionally. Jonah's story felt a little overdone, but I did really like that he realized he needed to tell someone what was going on with his mom, instead of trying to pretend like everything was fine and under control. Don't get me wrong, I liked that he and his older siblings did what they could for the younger ones, but I'm not the biggest fan of the older sibling(s) taking care of the younger ones because of dead/absent parents trope. 
 And I wasn't into the romance at all. I know their lives collided because of everything going on with both of them, but...it is most definitely a case of insta-love, so keep that in mind. I'm not the biggest fan of insta-love, but sometimes, it's okay. This was not one of those times, unfortunately. Their relationship worked, in its own way, with it being summer and particularly with Vivi, so the ending wasn't that surprising. But I felt like there was nothing between them- there didn't seem to be a lot of chemistry, and there's no build-up because insta-love. 
 I really would have been fine without the romance, and it didn't really fit. It didn't take away from the rest of the book, and overall, I ABSOLUTELY LOVED When We Collided. I just don't know that the romance fit- it definitely didn't work for me, because I liked both Vivi and Jonah, but not as a couple. 
 My Rating: 5 stars. I don't know that I did this book justice, but I thought it was completely amazing. After finishing it, I literally hugged this book for, like, at least 5 minutes.