Reading all the other reviews, I'm a bit confused as to what people are reading.
For me, this was a beautiful story that had a good pace throughout the two volumes.
For the plot, time travelling is a bit of a stretch in a drama and incest based BL, especially as the catalyst. However, this opened up to the father and son relationship. It makes the incest completely logical. I'm not a fan of incest (I didn't see the incest tag when I read this), I don't feel disgusted with this pairing at all. The emotions are 90% convincing. The 10% missing is because I don't see how you can have sex with a 15year old without internal struggle (ignoring the incest of course).
The emotions in this is just overwhelming. This takes incest to a whole different level (in a good way)
The art:
Ignore the horrible cover. The content is completely different. Every cover art I've seen has been gross. Like some rape scene. WHICH is so not true.
The inside however, was pretty good. I wouldn't say wonderful or anything because there aren't any reason to describe the art as that. The art is just, suitable. A bit sketchy at times, but fine. The expressions are the best parts. There's a lot of detail on the mouth, which is the most critical point of an expression.
The H scenes are a bit lacking but that is not the point of this manga. In fact, I wouldn't have minded if they skipped it.
A reviewer mentioned they were quite tired after reading it.
Yes. I agree, but in a good way. This manga stimulates a lot of brainwork. It's tiring in the sense that normally you don't go through this many emotions in 30mins.
Please read it. It's wonderful.