If by secret love you mean a person, you might try "kakushi" (concealed man). If you mean the love itself there is "mitsuu" (literally secret relations i.e. adultery) or if its secret to the other person maybe "okabore = unrequited, illicit love.) Sounds like you have some interesting homework.
Himitsu is secret秘密
Not really possible to translate directly.
Lol i love to call my bother Nii-chan (Onii-chan)
A Secret Love was created in 1979.
The Kempei Tai were the Imperial Japanese Army secret police. The Tokkei Tai were the Navy secret police and the Tokko Keitsatsu were the civilian secret police.
Aer'oj Hoecint is latin for secret love.
Japanese call their country "Nihon" or "Nippon".
Japanese call japan Nippon of Nihonn
in Japanese they call it Subaru
Love is love in Japanese = 愛は、愛です
Secret love could be translated as "amour caché" or "amour secret".
The kanji for love in Japanese is 愛.