A university student Matsubara Ryoji was living alone. But he had step uncle near the aparment, and he often went to his house. Because the step uncle was busy and often absent, for his wife and step daughter, Ryoji was reliable person. On the other hand, Ryoji secretly fell in love with the step aunt, Kasumi.
One day, the neighbor houses were robbed while they were absent. The step uncle proposed Ryoji would leave the aparment and live together.
