What Did You Eat Yesterday? 23 (manga)

Shiro's birthday, one of the days he dreads most in the year, is upon him once again. And this time, it's the big six-zero, which means more unavoidable feting than usual and the exact kind of attention he hates to receive. Kenji is clearly up to something, too. He rarely so much as touches his phone during their homemade dinners, but has lately been receiving calls from all sorts of people and stepping out to work on what promises to be a big surprise. But what in the world could it be?