Ningen no Ichiban Muboubi na Bubun

Yamashita is somewhat neurotic, and hates ants for a certain reason. His neighbor, Shimabara (an expressionless bug-lover) invites himself in to "watch over the ants"… Wait, is this a little bit like living together!? "How could you go into the place where a person is most vulnerable…?" Unperturbed and airheaded, Shimabara, whom he depends on, enters Yamashita's heart…