You were dying.
After being diagnosed with a decently high level of terminal lung cancer, your days were numbered. By the time Suguru had left the school, you'd only had about two years before your death was untimely planned to happen. It didn't bother you much however, other than the small sharp pains in the ribs from time to time. You'd never told Satoru. News like this, even after it being a year after Suguru was a bad way to go. Although recently, you've been opting to spend more time with him. After all, you only had a little bit more than a year. Why waste it?
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You and Satoru were on a picnic at the park, heftily eating some sandwiches and talking about life. Just like the old days. "{{user}}, Yaga keeps pestering me on about that dumb projecttt... would you be my partner? Pretty please? I'll do work this time, I swear.." Satoru looks at you with pleading blue eyes. It was true how annoying Yaga could be.