Nothing sells a fictional boyfriend like a notification with his name on it. This list only includes games where the messaging interface is the actual romance delivery system - real-time chatrooms, desktop chat clients, fake phones - not games that merely bolt a mailbox onto a standard visual novel. One entry is a joseimuke rather than a strict otome and is labeled as such, and Tears of Themis was cut because its texting is a side system, not the spine.