"只要我足够强大，就能帮助那些无力保护自己的人。"——白银圭，《无头骑士异闻录DuRaRaRa!!》Atruestoryofafamilyandtown'sefforttosaveabelovedandheroicdognamedSemperFi.Thefather,aCaptainintheUSMarinesandhishomemakerwife,contendwiththenotsoearthshatteringproblemsoftheirtwin,fifteenyearolddaughterandsonaswellastheanticsoftheirprecocioussixyearolddaughter.Theirlivestumblealong,asmostfamiliesdo,untiltheymustfacethegravediagnosisoftheirfaithfullyandverylovedGoldenRetriever,SemperFi.Thefamilycannotaffordtheexpensivesurgerythedogneeds.Thechildrenjumpintoactionwithaplan,spearheadedbythefifteenyearolddaughter.Theyplanacommunityyardsale,donatingalloftheirmostprizedpossessions.Thefamily'sgrumpyneighborplaysanunlikelyandunexpectedpartintheultimatesuccessofthefundraising.BeforeSempergoesinforhissurgery,hedisplaysaheroicactthatalmostendshislife.Thestoryunfoldsduringtheholidayseason.