cucirca.euは安全ですか？

Way too pushy with the ads. 2-3 of them before being able to start a video, only to be interrupted a minute into it by a sudden redirect. These ads are criminal in nature, including malware (e.g. advising you to update Flash when it's already up to date) and scams ("Congratulations! You are the X visitor!"). Though I'm sure this domain is not itself serving the ads, the fact remains that visiting here will directly contribute to infection with adware/malware and/or being scammed. You shouldn't come near this domain at all if you do not have plugin click-to-play functionality (antivirus rarely works against these threats) and, even if you do, you might not be able to watch a whole video before you get yanked away from it, turning your visit into a complete waste of time. Very little (if anything) to gain from visiting this domain, and everything to lose.