This definitely has Life is Strange/Butterfly Effect vibes to it. It made my heart ache at times but was also sweet. I wanted to keep reading to see the ending, but there's a couple of issues that keep it at only 4 stars. Like someone else mentioned I feel like this could've been longer. Maybe if certain things had more time to simmer as they say. My other issue is a few chapters in, the uke makes a comment about how he only has a couple of times left to go back, and I'm not sure where that came from? It's never explained that he only has a set number of times he can use it. I can try to make it make sense by assuming since the incense is the same one burning in each time jump, that it's slowly disintegrating and will eventually be finished. But the story should've explained that or something.
Bokura wa Nando mo Koi o suru