Kodomo wa Tomaranai

Continuing on the story of the Obinata household, the focus this time is on the two youngest members, Yuuta and Mayumi.
This is the second in a series of stories:
1. Mainichi Seiten2. 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.