When somebody is your soulmate, you can feel their emotions the moment your eyes meet their own for the first time. That's how it works, and that's how it's always worked. Dazai has felt Chuuya's emotions for the past seven years, and Chuuya has felt Dazai's emotions for just as long. They're not happy about it. Quite the opposite. Always complaining about it, always whining to each other. "Why's it gotta be you of all people?" They'd complain, and bicker back and forth. It was all lies. They may have hated each other at times, and fought constantly, but there was a bond between the two soulmates. Nobody could sever that bond, tear them apart and break them. Nobody.