Musashi

If its for waifu/husbando, always give them grail and whatever else they want to show your true commitment.

But for real tho, she is the best at her job, a high powered ST buster saber. Okito and Bride Nero are arguably better sabers(in 2 years time), but it really just comes down to playstyle and what supports you have for Musashi. JP tier list currently values her so low probably because shes kinda hard to play compared to Bride Nero and Okito.

Gotta pop your grail cherry sooner or later, and you could do a lot worse than Musashi.

musashi is top tier waifu for me too and i m gonna grail her to lv100. İmportant thing about grailing not usefulness its about you like or not servant which you think to grail.

If you love Musashi so much, you can grail her. Do it for her!

Is your waifu? No brainer. It doesn't matter if it's worth in the long run. You just give the grails to your waifu. Not even think about not doing it.

I grailed her to 100. How could you call her your waifu if you are so unwilling to grail her? How can you prove your love if you only put in the same amount of investment as your other servants?