I went to Hiroshima on my previous birthday. Using Seishun 18 kippu, it was one of the destination of my 5-day solo trip in Southern Japan (March 20-25th, 2017), apart from Osaka, Kyoto, and Nara.
I don't quite remember, but I think I told my parents that I'm going to be travelling alone. I also asked a friend who had experience of living in Japan if it's possible to go from Chiba, the city where I lived in, to Hiroshima in a day. She said it's doable, but a lil' bit too ambitious. But I did go anyway.
