Soukoku no Kusabi Hiiro no Kakera 3: Asu he no Tobira (2012)

A year and a half after all the events, Tamaki and company (except Mahiro and Yuuichi, who have already graduated) are now approaching their high school graduation. Tamaki wants to go to the same university as Yuuichi but Ashiya tells her it would be easier for all of them if she went to the college of his organization instead, since this way she can be more safe as the Tamayorihime than in a public university. However, this makes Tamaki deeply lonely, since it means she and her guardians can't be together forever...