The first series of The Kenji Chronicles. When he is younger, Kenji never pay attention on what his parents do for Obon. When he gets older, his curiosity leads the 14-year-old Kenji Himura to find out who his parents visit every year in Kyoto.
The second series of The Kenji Chronicles. Kenji's Genpuku.
Movie universe. After Kenshin defeating Shisio and before the final scene with Kaoru. Spoilers for Legend Ends.
After Jinchuu in the manga. Aoshi and Kenshin have a little talk during their tea.
Sometime after Jinchuu and before the rest of Kenshingumi leave. Kaoru ponders her relationship with the former hitokiri.
Plotholes from HZGG I and II
The big elephant is Xiao Yan Zi and Xiao Jian's family history. When the truth reveals, how do they cope? HZGG III AU.