Oh, this was in an affection date for Maria? I think I fixed it, thanks.
The only mention of kiss in an event for Maria or Hana is Maria saying "MC, maybe you can be her first kiss!"
Yes, one of the affection dates. :-)
The kiss that I mean is mentioned in the same dialog a little bit later, when Maria says: "What, we kiss? We get leeeeewd...?" and Hana says "Ehhh... I was hoping you forgot about that...". Maria then says "Of course not! That night was so fun, I would never forget it. I even got to kiss my childhood friend"
I am not sure if that kiss has happened (and I may just have forgotten about it), if it is something that happened off-screen or if it should have happened and it didn't.
I found the first meeting with Hana in my saves, then the rom-com cinema with MC, Ashley, Maria and Hana and then the travel to the beach with Maria, Hana and the MC, which seems to be the only point Hana got drunk (I am not sure why, but I don't get the beach-visit to trigger on that day again and I cannot return so many steps from the save after it, only read parts of the visit in the history, so I am not completely sure that the kiss was e.g. only visible and not readable).