Haven't seen this yet in this forum, in any case it was announced that Gakki and Hoshino Gen, who both acted together in NigeHaji are now in a "relationship with marriage in mind", aka they are engaged, and will get married "soon™"
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https://www.oricon.co.jp/news/2193908/full/
Gakki also announced that she will be leaving her agency going forward, likely giving her more freedom in doing less work in the future after both of them are married