We use a lot of new features in this; your browser seems to have some issues...

• It doesn't seem to support HTML5 video, which means that you won't be able to see any of the videos (obviously). Unless stated below, though, transitions should still work. You should strongly consider upgrading.
• It doesn't seem to support HTML5 audio, which means you won't be able to hear any of the amazing music. You should strongly consider upgrading.
• It doesn't seem to support the @font-face at-rule, which lets us display the Playtime and Gentium fonts used in Katawa Shoujo. Any browser released in the last 2 years or so should support it.
• It doesn't seem to support CSS transforms, which means that we won't be able to scale the window or show most transitions. Any browser released in the last 2 years ago should work.
• It doesn't seem to support CSS transitions, which means that transitions won't work. Videos should still work though, unless stated above. You should definitely try upgrading.
• It might not support SVG filters on HTML content, which means that filters like the sunset in the tea room will display as regular images. Unfortunately, this is only implemented in Firefox now.