Tsubasa-chan, Kimi wa: Matching shita Onna wa Satsujinki

A dull university student, Sousuke-kun's only comfort lies in messaging Tsubasa-chan, a girl he met on a dating app. A cute and kind girl, talking to her only leads to good things for Sousuke. But who is Tsubasa-chan, really? During their messaging, by chance when sending a casual message, Sousuke opened the curtains to the play of his own hell. The fated girl, "Tsubasa-chan," has set out to destroy his everything. So begins the unpredictable suspense story!

(Source: Kodansha, translated)