I picked this game up over the summer after noticing it looks very similar to Project SEKAI. The most notable aspect to me is that despite being an "idol" game with gacha, it features accuracy-based scoring, and unlike D4DJ Groovy Mix, which features accuracy scoring too but behind a monthly paywall, accuracy scoring is available as part of the basic package - no payment needed. And like D4DJ there are no "perfect lock" (a skill that converts imperfect hits into perfect hits) cards either, so you don't have to worry about your full combos or all perfects feeling less legitimate just because it turns your your party has a perfect lock card. And grades and rewards are based around it too. This I find to be a shocking and pleasant move because presumably, most gacha/idol-based rhythm games on mobile make the player's score dependent on card parameters and skills in order to nag people to roll the gacha, and likely spend money on gacha gems for pulls in hopes of pulling that ultra-rare card.

The basic gameplay itself, which is variable-note-length "hallway"-style vertical scroll rhythm gameplay, is where people immediately run away because "oh, this is a ProSeka ripoff". Yeah, it looks a lot like ProSeka, but to me it feels like a more refined version of the game: Holds don't have to be released with perfect timing, holds with flicks at the end are colored differently so you know to expect flicks partway through and/or at the end of the note, and there are segments where the chart turns into fixed-width-and-quantity lanes that look pretty and emphasize that this part of the song is special. Yes, Goods break your combo in this game, but they still award score and given that there's not one, but two different types of Perfects, and Great, I think this is fair. (From what I've seen: Shiny Perfect is 101%, Perfect is 100%, Great is 70%, and Good is 10%.)

Now at first glance, there seems to be four difficulty levels: Normal, Hard, Extra, and Stella. These charts potentially provide a tough but fair challenge to even tablet playres. But perform a certain action and you unlock *Olivier difficulty. Olivier uses its own difficulty scale and is where you find charts that may require 3 or more presses at once, and where the game starts to get seriously spicy.

That said, don't think that because this game features free accuracy scoring, it means you can just ignore the gacha. There are a series of missions that are needed for song unlocks, and those depend on gacha-based score instead. And good gods, the way card skills and parameters work in this game are surprisingly complex. Instead of just card skills being "[score multiplier/healing/whatever] every time you pass this point in the song", each song has a unique chart detailing where card skills will activate. And card skills also have cooldowns: If the cooldown on a skill has not finished by the next activation point for that card's skill, it will not activate.

The songlist is okay. Of the originals, "Diamond no Chikai" stuck out to me the most. There are some covers as well, such as "Shiny Smily Story", and I was amused to find a cover of "Snow halation" from Love Live!.

Now, in the interest of transparency: I only know basic Japanese at best. Only enough to know some basic sentences and vocabulary, both general and rhythm game-specific. So my assessment of this game's system isn't exactly fair. If this game ever gets a localized release in English or Tagalog, but fat chance, or if I bother to re-study Japanese, I will be able to make a better assessment about this game's mechanics besides "hit note get points".