The comedy was sometimes funny, but other times a bit corny. The cliche "drama" of typical romantic misunderstandings was a bit silly and bland. But overall I kind of enjoyed the Manga.
The thing I don't understand is what happened to the 23 year old version of Marina who went back in time, but then returned to the future? Where and what time did she return to? Did she go back to her original timeline to be with her original husband who is dying? Did he die, or did the change in the past cause him to survive? Or did those become 2 completely separate timelines that are not related to each other?
If the 2 timelines are completely separate, then shouldn't memories not be shared between timelines? The future Marina that didn't time-leap shouldn't be able to have memories of her time traveling version. Or are they all in the same timeline? If they're the same, and she returned to the exact time when she originally left , she should have appeared in the time laboratory (like falling out of a portal in the ceiling) instead of instantaneously remembering her time travel experience when receiving a marriage proposal.
And what was really left out was an explanation as to why he waited until Marina turned 25 to speak with her, instead of meeting at 19 like in the original timeline. Unless he wanted to wait until after he became ill and got the transplant. Another thing that wasn't explained is the time machine, how it worked, and how someone like Marina can simply use it on herself. Also, in the alternate future timeline, Marina learns about a job in a time machine laboratory, when she is 25. But in the original timeline, she used the time machine when she was 23.