In one of Japan's most horrendous sex crime cases, Joji Obara was sentenced to life in jail on Tuesday for raping eight women and drugging, raping and killing a 21-year-old Australian bar hostess, but cleared of similar charges in Blackman's case.
Her mother Jane Steare said she received a telephone call from the British Embassy in Japan to say the Tokyo Public Prosecutor would be appealing against Obara's acquittal.
"I believe that there are grounds to be optimistic that an appeal will succeed. All I have ever wanted is justice for my darling daughter Lucie."
The case of Blackman, a former British Airways flight attendant, has attracted international attention and highlighted the dangers faced by women working in Japan's hostess clubs, where men pay huge sums to drink and chat with women.
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