Tantei Opera Milky Holmes: Psycho no Aisatsu

With their powers restored, the four members of Milky Holmes are solving phantom-thief cases so successfully that student council president Henriette begins to consider their graduation. Before they can leave the detective academy, however, they must pass a final test.

The case Henriette selects concerns stolen cards belonging to Vanguard player Aichi Sendou. Recovering his treasured cards becomes more than another investigation for the girls: it is their opportunity to prove that they are ready to move beyond their days as students.