>>909
ちなreflog

$ git reflog
1a804d9 (HEAD -> master, develop) HEAD@{0}: merge develop: Fast-forward
b0325fc HEAD@{1}: checkout: moving from develop to master
1a804d9 (HEAD -> master, develop) HEAD@{2}: merge feature5: Fast-forward
ba4e962 HEAD@{3}: checkout: moving from feature5 to develop
1a804d9 (HEAD -> master, develop) HEAD@{4}: commit: impl5
ba4e962 HEAD@{5}: checkout: moving from develop to feature5
ba4e962 HEAD@{6}: merge feature4: Fast-forward
a32e11d HEAD@{7}: checkout: moving from feature4 to develop
ba4e962 HEAD@{8}: commit: impl4
a32e11d HEAD@{9}: checkout: moving from develop to feature4
a32e11d HEAD@{10}: merge feature3: Fast-forward
8d9924f HEAD@{11}: checkout: moving from feature3 to develop
a32e11d HEAD@{12}: commit: impl3
8d9924f HEAD@{13}: checkout: moving from develop to feature3
8d9924f HEAD@{14}: merge feature2: Fast-forward
0f78740 HEAD@{15}: checkout: moving from feature2 to develop
8d9924f HEAD@{16}: commit: impl2
0f78740 HEAD@{17}: checkout: moving from develop to feature2
0f78740 HEAD@{18}: merge feature1: Fast-forward
47792a3 HEAD@{19}: checkout: moving from feature1 to develop
0f78740 HEAD@{20}: commit: impl1
47792a3 HEAD@{21}: checkout: moving from develop to feature1
47792a3 HEAD@{22}: merge feature0: Fast-forward
b0325fc HEAD@{23}: checkout: moving from feature0 to develop
47792a3 HEAD@{24}: commit: impl0
b0325fc HEAD@{25}: checkout: moving from master to feature0
b0325fc HEAD@{26}: commit (initial): initial