Despite all appearing to be a suicide case, Conan is certain that Hoshie is the culprit and investigates on how she delivered the poison to her husband, finally finding several pieces of critical evidence and exposing her. On the way home, Ran is visibly saddened since she thinks she is the only one of her acquaintances not to have received a White Day gift, but is cheered up when she discovers white throat lozenge from a postage left by Shinichi.