Isoganaide.

This is the fifth in a series of stories:

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