>>917,926
ちな --no-ff 版、
今出すと余計に混乱するかもだが。

$ git log --graph --branches --oneline
* a5aaf72 (HEAD -> master, develop) Merge branch 'feature5' into develop
|\
| * e03bcd0 impl5
|/
* 324df68 Merge branch 'feature4' into develop
|\
| * c2634c4 impl4
|/
* 68ed20a Merge branch 'feature3' into develop
|\
| * 5e12b99 impl3
|/
* 608e5d7 Merge branch 'feature2' into develop
|\
| * 4660e46 impl2
|/
* 3924eae Merge branch 'feature1' into develop
|\
| * 138d83f impl1
|/
* 7db4424 Merge branch 'feature0' into develop
|\
| * 8877414 impl0
|/
* ec041f9 initial