Sanpakugan-chan wa Tsutaetai.

Meet Amane Mizuno a girl with fierce sanpaku eyes and a pure heart! She has recently fallen for a boy named Katou, who has the exact opposite attitude! Will the tender-hearted Amane ever tell him how she feels?!

(Source: Denpa)

Originally uploaded to Twitter, after six chapters it was serialised by GANGANpixiv, where it is being republished and now continues.