Due to certain circumstances, Eri finds herself moving into the home of a relative with a mysterious reputation. The kind and beautiful woman who becomes her mother through a custom called “smallerjoining” bears a striking resemblance to that person, leaving her breathless… This is the ultimate collection of short stories featuring only strong, weak, beautiful, and dirty girls, including the title story of stepmother × black-haired girl, plus additional illustrations, a newly drawn epilog, and the first-ever published idea notes of Ugawa Hiroki. **Contents:** 1. Smallerjoining Part Front 2. Smallerjoining Part Back 3. Smallerjoining After Story 4. Two-Flower Plant 5. Walk wit me Part Front 6. Walk wit me Part Back 7. after Walk wit me 8. Idea Notes