Hellooo, can anyone help me? I read a menga a lot time ago but i don't remeber the title a...

Hellooo, can anyone help me? I read a menga a lot time ago but i don't remeber the title and i really wish to find it. It is a school life about two teenagers, a redhead and a black haired guy, who took part in a music club about guitars. The guys are respectivly extroverted and funny and the other one is shy.
I remeber a particular chapter where they (after they started to live together) went on school festival and the shy one got drunk.
This is all i remeber, id be happy if you found it for me. Thanks