Aki-chan no Iibun

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... A sensitive love story. (Source: DMP)

This is the fourth in a series of stories: 1. Mainichi Seiten 2. Kodomo wa Tomaranai 3. Children's Time *4\. Kodomo no Iibun* 5. Isoganaide. 6. Hanaya no Nikai de Although not specifically "sequels", this is the order that the stories were written/published in.