Personally - I'd suggest trying to make the clickable interactions / items more obvious somehow. Not sure how, but I'll be honest.. I didn't realize there was a clickable interaction at the cafe / English tutoring session till someone in this thread mentioned it. I wasn't looking for any clickables or such - the only one I was aware of was Kumi's phone in the hospital (and only that due to the dev mentioning to keep an eye out for an extra scene in the hospital in a post / update notes).
I'm also left wondering if there are more than these 2? I dunno, might be... but apart from playing again and trying to click absolutely everything... I can't think of anything off the top of my head.
You could put different color highlights or a distinct border around these objects (along with a note at the start that these exist). Or could do as some others do with these things (ie Crimson High and it's 'hamsters') and have a "help system" that will pop up a msg/alert whenever an intractable is on the screen.
For instance - in Crimson High I have it set to the "poor vision person" option (I do have poor vision) which pops up for like 30-60 seconds big text on the screen "A Hamster is on the screen" which lets me know it's time to hunt the hamster down. The game does have a less intrusive mode, which just pops up a smaller alert to let ppl who have turned "hints" on to let them know a hamster is on the screen.
Not saying you should do the exact same thing... lol but just an illustration of how other games do it.
Another thing, there's a scene right near the start I just can't seem to figure out how to activate. Going through the game images... I see there are 2 versions of hugging Kumi when she visit's you. One where you hug her, and another one where she apparently hugs you back.
The first one is easy to achieve... but I've tried multiple things for the 2nd one, and can't seem to work it out. I might be overthinking things, or it might be a multistep thing to get it... or one of those clickables I miss. lol
Another thing from the images I've never seen - the tombstone images and videos. How are you supposed to get these? Or is this a bad end I've never gotten? And if so, how? or maybe I need to actually ask about her dad at some point to get it? I dunno.