Nagisa Kubo from Kubo Won't Let Me Be Invisible (Kubo-san wa Mobu o Yurusanai)
I can't with her cuteness. Along with other cunning girls in romcom anime like Mie, Nagatoro, and the president of all...Takagi-san.

[Illustrious] NEW!

Use kubonagisa to summon her then...

Use student uniform, red neckerchief, white shirt, black serafuku, open cardigan, black skirt, black socks, loafers to summon her default student uniform, omit tags that don't appear in the intended camera angle(eg. omit loafers if the composition is portrait/cowboy shot)
Use blue track suit, short shorts, uwabaki, white footwear, orange footwear to summon her PE uniform

[SD1.5]

Use kubonagisa to summon her, use purple eyes, purple hair, long hair, bangs to form her head, to get her default school uniform, add school uniform, cardigan, black skirt, red serafuku, or else...you can go wild with clothing, this one is quite flexible.