Very sad but a very moving story. Being someone who was faced with losing a loved one to an incurable disease at a young age, this type of story is always hard to watch. But the courage and positive energy Yuuki possessed was absolutely amazing to watch. It's a hard thing for someone to stay so positive and optimistic when facing death but Yuuki was never short of an encouraging word to each of his friends even though he was the one facing all the hardships. Yes it's sad and tears will be shed but you won't regret watching it. Makes you appreciate life a little more and reminds you that tomorrow isn't a guarantee.