My cool and expressionless childhood friend keeps sending me lazy messages every day on LINE, but when I read the first letters vertically, it spells out "I like you"～Wait? Could this be...a confession?～

Nanohara Yukina is my childhood friend. We've been going to the same school from kindergarten all the way through high school. Nanohara's expression doesn't change much, and her way of speaking is formal and stiff, so she often gives off a curt impression. However, her true nature is mischievous and childish. I often receive LINE messages from Nanohara like that. The contents are ordinary teasing. "Geez, Haruya-kun, you sure are harsh with girls today too." "That's why you can't get a girlfriend." ...That's none of your business. However, one day, when I read the vertical lines of a message from her, I noticed that it began with "suki" (like). And for the past week, it's been every single day. ...Eh, this... does this mean she likes me? Am I being confessed to? ...No, it could be a coincidence. I can't tell from this. It's only two characters. Since I couldn't tell, I decided to observe the situation. What's really going on? Is it intentional or not? Still, Nanohara keeps sending messages that start with "su" and "ki." But that's all it is, so it's hard to bring up. We exchange LINEs while feeling frustrated. Damn it, which is it, you...! This is a story about the frustratingly ambiguous exchanges between such a protagonist and his childhood friend. #Also posted on Kakuyomu