So I have read this a few years back and I cannot remember the name of this manga at all!! :(
The story is a typical high school romance, the fl is the senior and the ml is a junior of just one year. The ml likes the fl but never confessed directly and usually hangs around her and teases her a lot. The fl is completely oblivious and also very adamant on being the reliable senior of the ml. The fl has light cyan and blue hair with pigtails? The ml i don't know i forgot :(
If anyone knows what it is I'd be really happy if you shared!! :D