Getting admission in Bunka Fashion College?

I am an undergraduate student majoring in Computer Science. I am planning on applying for Bunka Flash College in Tokyo. My Japanese is good, I can draw and interested in fashion industry.
Is it necessary that my major in undergraduate should be arts related to get an admission at Bubka ?

"Is it necessary that my major in undergraduate should be arts related to get an admission at Bubka ?"

I don't think it is necessary. You should not worry about it. But, you want to make sure, you can easily contact the school and ask for details.

"My Japanese is good, I can draw and interested in fashion industry"

You think your Japanese is good which doesn't necessarily mean you are good at Japanese. I am afraid you need to pass at least JLPT N2 to enter your college.
The JLPT is important for applying to senmongakkou as far as I know.

Please, don't think that my answers are very correct. To make sure of everything, you need to contact the college and ask them for more details.

I wish you all the best.

Bunka Fashion College is a two-year college/vocational school that people out of senior high school (around age 18) in Japan would attend.

Check under "Applications and Tuition Fees" - 2- (1) must mean "Applicants do not need to be of Japanese nationality" I assume :). See 2-(3) and (4) for the Japanese language requirement.

http://www.bunka-fc.ac.jp/en/
http://www.bunka-fc.ac.jp/en/applications.pdf