Learning ExperienceThe good thingsIt is a good place for fresh graduate to join this company as they are willing to giving opportunity to the new people to handle big scale projects.
You don't expect seniors to teach you or guide you, but they willing to guide and share their knowledge/experiences if you ask them.
Generally, most of the people there are nice and friendly.
Pay wise, they are not very attractive.
The challengesThere are many seniors who have been working there for more than 20 years. Dealing with these people requires skills and some respects. Probable they are too senior in the company and hardly listen to your new ideas, proposal or suggestions.
As Chiyoda is a japanese company, so promotion is somehow based on seniority. The longer you stay, the higher the chance for you to be promoted.