I don't think so. Ai was an orphan living on her own without family, the twins are registered under the directors' family. they couldn't sue without going public. and I don't think the family of the murderer could even pay that much, and a trial would be the worst possible thing for everyone to endure. they would try to say that Ai has partial responsibility because she opened the door or something like that.

something else: in the manga, one of the twitter comments accuses Shinzo Abe (the Japanese prime minister) as being weak on crime. this did not age well, and they were right to remove it from the anime.

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