I am looking for one specific comic, very similar to this one (at least as a template, not the punchline), except it was about Haibane Renmei - the trick or treating kid was dressed as Reki I believe and was asking for ciggs, it broke my heart many years ago and now its eating away on my mind, please please I tried Yandex and Google but I couldn't find anything.

Any recommendations regarding how to go about finding stuff like this in the future by myself?