@Ulysseswho1 Up to the point the manga is at currently (Chapter 30) it's implied that Suzuki is just a weirdo. Probably has something to do with how often she bumped her head in middle school.
There are two volumes. Volume 2 adds chapter 16 to 31 and 5 goodies.
Edit: at the bottom is a list of where you can buy it. If you do have an japanese amazon account, you can just buy ist as the kindle version.