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Source)
Not translating the whole thing but in a nutshell, Matchy was the one who nudged Higashi into it, saying that "isn't it a good age for him to get married already?". Higashi turned to Matchy a lot for advice on marriage. Matchy hopes that their marriage will influence their work and their life positively from now onwards.
Nicky has heard a lot of good news in his life, but he has never felt more happy. He is looking forward to news on a second generation.
Katchan feels really happy, as if it was his marriage haha
TOKIO's Joshima has always looked up to Higashi, who taught him to "practice like it's the real thing and do the real thing like it's a practice". He hopes that 少年隊 will carry on forever!
TOKIO's Mabo is really really really happy for his senpai, and hopes that he'll get to work with them together one day. He ends with a "senpai, may happiness be eternal for you!" (sort of literal translation ;w;)
V6's Sakamoto congratulates them, and that saying it 10 or 100 times is not enough about just how happy he is for them.
KinKi Kids' Koichi is really happy for his senpai, and wishes them to have a happy household, and hopes that they'll still carry on their work!
Narimiya Hiroki (Kimura's kouhai (agency)) regarded Kimura as his big sister, so he can't believe that she's now married XD He's a bit lonely because of this but he's really happy for her too.
Sasaki Nozomi (same as Narimiya) is of course, really happy for them and hopes that Kimura will remain pretty, cute and lovely as always. She wishes the both of them happiness.
My love for everyone +100000000