Taiga works at a publishing company, and thanks to his sister's sudden marriage, author and Taiga's best high school friend Shu has become his brother-in-law. But then his sister suddenly disappears! Left behind, Taiga ends up taking care of his little brothers and living against his will with Shu. Their lively and raucous lives filled with trials accidentally draw them closer together. And actually, for Taiga, there's a certain feeling he had long ago that just won't disappear…