Welcome to the NHK
This one showed me what not to become because of the hermit like ways. It was funny because the male lead Tatsuhiro was such a shut-in that he had almost no common sense. He blindly followed his senpai to a suicide jump on an island. He thought that she was in love with him and wanted to start a new life. He could only interact with people one on one and he also thought that it was conspiracy that kept him shut in his own apartment. In the end though he realized that he could maintain his shut-in ways. Hell he even fell in love.