thirteen episodes
...that each title of the thirteen episodes of the 2007 Japanese animated television series Blue Drop: Tenshitachi no Gikyoku is the name of a flower seen in that episode?
...that each title of the <b id="mwA3Y"><a class="mw-redirect" href="./List_of_Blue_Drop:_Tenshitachi_no_Gikyoku_episodes" id="mwA3c" rel="mw:WikiLink" title="List of Blue Drop: Tenshitachi no Gikyoku episodes">thirteen episodes</a></b> of the 2007 <a href="./Japan" id="mwA3g" rel="mw:WikiLink" title="Japan">Japanese</a> <a href="./Anime" id="mwA3k" rel="mw:WikiLink" title="Anime">animated</a> <a class="mw-redirect" href="./Television_series" id="mwA3o" rel="mw:WikiLink" title="Television series">television series</a> <a href="./Blue_Drop#Anime_2" id="mwA3s" rel="mw:WikiLink" title="Blue Drop"><i id="mwA3w">Blue Drop: Tenshitachi no Gikyoku</i></a> is the name of a flower seen in that episode?