History Recap / TheKindaichiCaseFilesTheBlackButterflyOfDeathMurderCase

Itsuki, after seeing in the promotional image the man who was the culprit in a previous case in which he himself, Kindaichi, and Miyuki were involved, contacts the latter two, and all three of them attend the promoted event in Kanazawa, only to find themselves getting involved in yet another serial murder case.

* SiblingMurder: What really causes the culprit to be DrivenToSuicide is the realization after the truth is revealed that the two girls he's killed turn out to be his ''sisters''.

* AbusiveParents: Played with, regarding Shimon and Midori Madarame. Shimon isn't physically abusive to his three daughters, but it's clear he views them mainly as specimens in his collection to the point he named all three of them after different types of butterflies. It's greatly implied all three girls dislike their father because he sees them as things. In Midori's case, she can be considered abusive because she impregnated herself with frozen sperm samples taken from her deceased boyfriend Minoru and tricked Shimon into thinking he was the biological father of her children. Because Shimon drove Minoru to suicide by stealing his life's work, Midori tried to get revenge by having Shimon raise Minoru's children and hoped to reveal the truth on Shimon's death bed. In this case, while Midori loved her daughters and never did anything to directly hurt them, Midori gave birth to and exploited them for the sake of avenging Minoru's death. In the process, she gave up her firstborn son to be raised by Minoru's mother who then grew up believing Midori was a horrible woman who betrayed his father. Under the idea Midori genuinely did betray Minoru to marry Shimon and live a wealthy lifestyle with their three daughters, the son wants to avenge his dad and murders two of his sisters and Shimon. Once her son's identity is revealed, Midori tearfully admits her scheme and realizes it backfired horribly.

* PoorCommunicationKills: This murder case involves the culprit doing RevengeByProxy against his mother, who he believes abandoned his biological father for the man that drove him [[DrivenToSuicide to suicide]] after [[StealingTheCredit stealing his life's work]], by murdering two of her three daughters and the man in question. He only learns that said mother only married said man and conceived her daughters via sperm samples of his father for the sake of screwing him over...meaning he actually murdered his own sisters. Both he and his mother are horrified after realizing the weight of their actions.

* StarCrossedLovers: The ancient local legend that has been passed down for generations in Kanazawa regarding the luminous black butterflies centers around a couple that was forcibly kept apart: There was a couple living in the local village who were deeply in love, but the village chief's son fell in love with the wife, and he resorted to killing the husband and taking the now-widowed wife by force. While she seemed happy to be wed to the village chief's son and birthed three beautiful daughters, it didn't last, for she voiced a curse before she and her daughters [[DrivenToSuicide killed themselves]] via [[SlashedThroat slitting their own throats]]. Several days afterwards, four luminous black butterflies appeared in front of the village chief's house. Everyone who lived in the village chief's house, many villagers, and especially the men who helped in killing the wife's first husband, fell ill due to an infectious disease outbreak and died from it, with their own bodies themselves turning black, and more and more black butterflies appeared with each death, until thousands of such butterflies descended upon the village, by which point over half the villagers had perished. It's what earned these butterflies a notorious reputation as harbingers of death -- their tendency to congregate to recently-deceased bodies doesn't help.

Itsuki, after seeing in the promotional image the man who was the culprit in a previous case in which he himself, Kindaichi, and Miyuki were involved, contacts the latter two, and all three of them attend the promoted event, only to find themselves getting involved in yet another serial murder case.

* ButNotTooForeign: According to the butterfly researcher (and a professor as well) in a university where Midori and Minoru worked as researchers in their college days, Midori's TechnicolorEyes is due to her mixed blood -- her father was Russian. Her children, therefore, have some Russian heritage as well, if to a lesser extent.

* SmallRoleBigImpact: A butterfly researcher (and a professor as well) in a university where Midori and Minoru worked as researchers in their college days turns out to have been the one who informed Shimon Madarame of the new butterfly species discovery. As he confesses when the case is concluding, he had to do so to keep the lab going because the butterfly research lab was about to be shut down and Shimon Madarame was the only one funding it. This also leads to him being a/the UnwittingInstigatorOfDoom, given how big a disaster the ensuing events have turned out to be. To his credit, however, [[ItsAllMyFault he's quite aware of the role he played in the whole mess]], and by the time of Ageha's wedding, he's managed to convince the Scholar's Association to have Minoru officially recognized as the discoverer of the new butterfly species and its scientific name christened after him as well in order to SetRightWhatOnceWentWrong.