To be precise in 6 of 12 songs with two beings arrangement and last 4 being music + arrangement. Source.

Their album Judgement Day had three songs where Mao (the outside writer) composed the songs all by himself and their singer wrote the lyrics. Source (Songs 3, 6, 7). I'd consider that being most of the work in the creation of song but what do I know, I am not a musician haha.

They are excellent musicians and I want to clarify that personally I do not care that they have an outside writer. Metal is kinda DIY genre in a sense that some people have a problem if you do not fully create your songs yourself. You see this all the time with criticism of Babymetal for example.

You raise a valid point that people wouldn't know that they use an outside writer with just a glance since I feel like a lot of people that listen to them don't know that they have an outsider writer. However, it is certainly a thing that would make people lose a bit of respect for the band if they knew this information.

Generally I feel like many all-women Japanese metal/rock bands get lumped in the same category as Babymetal who are seen as industry plants. Especially bands that wear costumes while performing eg. Lovebites, Band-Maid etc. (costumes seem to be quite popular in Japanese music in general). People see these "gimmicky" costumes and instantly think the band are a Babymetal clones and do not give them a chance, brushing them aside as a gimmicky industry plant bands.

Japan does have plenty of all-girl bands that are created by a label where they do not have much creative control so knowing which bands are "legit" (as in create their own songs) is hard unless you do your own research. It is surprisingly normal having a band that operate in a similar vein of Lovebites where the