I recently picked up Sailor Manyo Yomogi and absolutely love it. The teal-ish blue is right up my alley and the ink performance is pretty spectacular. Great flow, fast drying, no bleed through, little show through, no ignition issues, and no smearing. The color is vibrant blue with more than a hint of teal or light turquoise. It might sheen some on the fringes on some paper (looking at you Tomoe River) but not on copy paper or bagasse. Has that Sailor ink smell but it dissipates fast. The squarish bottle is really quite nice. This will be a go-to ink for sure.
Not much for water resistance but that is no surprise.
Chromatography shows perhaps just two dye components. Cerulean blue and a yellow (yellow and blue make green) or maybe it is a frank light green dye. Simple ink anyway but beautiful.