TL;DR: There is a forest in it... but it's about so much more than a forest.
Heavenly Forest the best example of where the title has been changed to something horrible and cheesy sounding rather than having a literal translation from the Japanese title which would be 'I only love you' or 'I just love you' (ただ、君を愛してる).
This film was one of the first that I ever rented from a Tsutaya (the most common dvd rental chain in Japan, which also rents out a huge selection of CDs) when I was on exchange in Japan in 2007. It had just been released on dvd and I was really excited about suddenly having access to all these Japanese films which previously I had had to download all the time (back then not even JBHiFi had a very large selection of foreign films and certainly no recent ones). It was actually my older host brother who chose it though and from that I got the impression that it wasn't just considered to be a chick flick but had a little bit more to it.
Heavenly Forest follows a few typical trends in Japanese romances- it’s about unrequited love which spans over a lifetime, it’s named after a song which features in the film and the ‘twist’ ending isn’t anything you won’t have seen before. So whilst in that sense it is your typical Japanese romance film, I found it to be really well done and not have the same sickly taste of bitter sweetness that many others leave behind (I’m thinking of films like ‘Nada sou sou’ 涙そうそう and pretty much every one with Aragaki Yui in it…). Not that it isn’t bitter sweet (or 切ない / Setsunai as it would be referred to in Japanese). It most definitely is. It’s just that the plot makes it feel justifiable, where in many films it is played up a lot.
Another reason is that Miyazaki Aoi’s (宮崎あおい) character is so likeable. She is sweet and cute in a genuinely quirky way and at the same time totally believable as an oddball. It’s also nice to see the main female character in a Japanese romance being the one to make advances on the guy for once (although I suppose this happens in Nodame Cantable too, maybe it’s something to do with Hiroshi Tamaki?). This film also sticks out in my mind because of how naturally graceful and beautiful Miyazaki is. The huge photo of her hanging on the gallery wall in one of the final scenes is an image that stuck with me.
So whilst it isn't totally original, I would recommend this film because of it’s genuine tugs at your heartstrings and likeable characters.