"没有人可以选择自己的故事，我们所能选择的只有应对方式。"——岛田梨沙子，《无头骑士异闻录DuRaRaRa!!》Bipedalism,or'two-footedwalking',isthestoryofapainterwhogrewupinanorphanageandonlyyearslaterlearnsthecircumstancesofhisfather'sdisappearanceanddeath.Childhoodmemoriesbringthemaincharacterbacktothepasthebuysahouseinthesuburbsthatusedtobelongtohisfamily.Inthebasement,hefindshisfather'sarchivesandscientificresearchdocumentsonthehybridizationofhumanracewithrelatedbiologicalspecies.Studyingthearchivematerial,heunexpectedlyfindsevidenceofeffortstorenewtheexperimentsontheremaininghybridpopulation.Thepainterthenbecomesaresearcher,andconsequentlyavictim.Thebasicideaofhisfather'sresearchwastochange,controlandinfluencetheprocessofhumanevolution-initiallyconnectedwitheugenicstheoriesoftheperiodbeforeWorldWarII,andnowbeingplacedinacontextofmodern'biotechnological'expectationsbyhisformercolleagues.Themaincharactertriestorecreateandrealizehisfather'sheritage,whowasforcedtocooperatewithstateterrororganizations,usingtheresultsofhissecretresearch.Inatragicmanner,thisinformationturnsintothemaincharacter'sreality,atfirstforcinghimtoreappraisehisfather'svaluesandlaterdrivinghimtomadness.