30MS SIS-N00 Sourei [Color B]

NOTE: The listed image depicts two copies of the Sourei Kit with additions, the gun and Color C parts are not included.

Sourei, a modern Japanese schoolgirl Oni, is one of the most fun kits in the 30MS lineup, with some surprising possibilities.
She is a Color B, A-Type body that uses small face plates (like Altria Caster FGO).

Aesthetics:
The kit has a few things going on, as it's a mix of themes, the primary one being 'Japanese'.
Sourei, being a Japanese schoolgirl, wears a crop top reminiscent of a sailor school uniform with puffy sleeves and a Shinto rope ribbon, along with a pair of modern sneakers. Underneath it she's wearing a strapless swimsuit with hip ruffles.
Adding her 'Oni' parts (Japanese Ogre/demon), she gains a pair of tall blue horns sticking out of her bangs, a samurai styled left shoulder plate and a demon face right shoulder plate with an attached back plate - Whether you think these are cyberpunk or toy themed with their black-on-light-blue plastic is up to you.

Compatibility (Equipment, body, head):
There's a lot here - First of all, it's an asymmetrical kit that uses two different shoulder armors - As the attached image demonstrates, you can buy two kits and attach a demon face on each shoulder, with room to fit both back plates either in front or behind the model.
I've placed the samurai plates on the 3mm thigh rings with pegs, as pseudo skirt/leg armor (depending on how you turn it).

If you have the 30MS Marical kit, you will have two specific parts left over, which are the chest and hips sections, allowing you to convert Sourei's body into a Color C kit, with two exceptions - Sourei's necks are short and one of them has a slot for the choker, so you either need to find a compatible one or to use a different Color C neck. Her right arm has a small patch of Color B skin - If you have two copies of this kit, you can use the left arm (bicep down) and swap it out. From there you need to replace the thighs and hands, making it a fairly easy swap.

Sourei's head is a small type that fits small face plates. Putting the hair on a different head enables you to use regular face plates with her brown bob (and horned bangs if you want).

Equipment:
2 Bangs - With and without Oni Horns
Demon Head Right Shoulder with attached Back Plate on a 3mm peg (also works as a front plate) - You can attach the demon's face on her head instead of her bangs
Lamellar-style Samurai Left Shoulder Plate, attached on the 3mm bicep ring peg
1 long Katana with a white blade and tsuba
1 transparent Misty-Flame Part for the katana (slides on in either direction)
3 pairs of Color B Hands - Fists, Holding and Spread Open
1 Bicep Ring Part in white
1 set of Blue Ring Parts
2 Bicep Armbands in Blue, one with and one without a 3mm peg
3mm Peg Extender
1 Pair of Color B, bare shoulders (useful if you want to display her in the swimsuit without the shirt but keep the sleeves only going up to her biceps)
Various small leftover parts (left thigh without insides, elbow joints, color B chest internal and short Color B neck)

Conclusion:
It's a very nice kit, especially for the price, that allows you to do a variety of things, the compatibility is a solid A-grade. Asymmetrical armor kits are always fun to get two of.
The aesthetics, despite being so disparate in types, come together nicely in a mix of modern and traditional Japanese themes.
The katana is fairly large for her height and would go well with other HG height kits.