Academics:
Some students I know have struggled finding classes taught in English that are transferable to their home university, but I know others who have found classes that apply to their degree path. Sometimes, the "Language of Instruction" part on the Hiroshima University syllabus is a lie. It may say "Japanese/English" for some classes, but there is a chance those classes will be taught entirely in Japanese.
Living Situation:
The living situation is really you get what you pay for. The dorms are small and old, and you have to share showers or toilets with other students (depending on the type of dorm), but the dorms are extremely cheap. Cleaners come in once a week to clean the dorms. The Japanese are generally very clean, so the dorm living situation is really not too bad once you get used to it.
Cultural Immersion: It can be difficult for some students to make close Japanese friends. If you are not Japanese, you are immediately considered an outsider by some Japanese and have to work harder than the average Japanese person to become good friends with them. However, there are international exchange events and clubs that exist with the purpose of bringing Japanese and foreign students together.
Program Administration: I personally had no issues with administration before entering Japan and upon arrival. I think USAC and Hiroshima University did an excellent job helping students prepare for study abroad.
Health & Safety: Japan is extremely strict with COVID, so you can expect to wear a mask almost everywhere. Japanese take masks and sanitation very seriously, so you can also expect to see hand sanitizing stations everywhere. Crime rates in Japan are also very low, and many people feel safe walking alone in the middle of the night.
Community: Hiroshima University is located in Saijo, which is a somewhat rural area in Higashihiroshima in Hiroshima prefecture. Saijo Station is roughly 40 minutes away from Hiroshima Station by train. There is not much to do where the campus is located, but some students take frequent trips to Hiroshima City as that is where the closest city life is. You can also take the bullet train from Hiroshima Station to other big cities in Japan.
Overall, studying abroad in Japan was one of the best decisions I have ever made. I have made many lifelong friends and improved my Japanese immensely. I would highly recommend anyone who is really interested in improving their Japanese and learning the Japanese way of life to study abroad.