Tachibana Tsubomi is now a fourth grader! While at the park with her best friends Reia and Yae, she is shocked to see a couple kissing. After returning home, a small 'seed' (happening) comes her way, leaving her heart racing!? This moving story follows Tsubomi as she grows both mentally and physically, experiencing various things and emotions through a lost bird. In addition to the title story, this volume includes "One Day Happening," "Boys and Girls," "LOVE・LIKE・COMIC," and "To You I Will Never Meet Again"!