
If you can read Spanish, and don't mind using google translate. Here's where I found the scans, http://www.sekaimanga.net/Sekai/manga-yarichin-bitch-club.html.

I understand Spanish so what you said is basically right. Yacchan is actually pretending to be something he's not. He only approached Toono to go along with his "kind and friendly" act he puts on. Now that he knows Yuu is interested in Toono, he wants to take him away from Yuu in a form of revenge, or to cause him heartache. In the past everyone preferred Yuu over him, even the girls Yacchan liked. Yuu has always been kind, friendly, treats everyone the same, and smiles all the time. So Yacchan wanted to be liked just as much as Yuu, he wants to be like Yuu, which is why now he puts up the kind and adorable act.

I may or may not have shattered glass with my fangirl squealing when I saw your link. Sooo-thankyouthankyouthankyou!!!!!

I FCKING KNEW IT. HE'S FCKING TWO-FACED--
Initial reaction after reading this: //sobbing miserably because my threesome fantasies have burned down into flames
Don't read if you don't want spoilers!
So being the impatient fudanshi I am. I decided to scope the interwebs for raws or translations. I found Spanish translations up to chapter 7! It was a pain to stop and use google translate to decode what was being said, but it was worth it! If you already think that Yacchan likes Toono... then you're wrong! He's only going after him in order to make Yuu/Kashima heartbroken. Because in the past, Yuu was favored more than him, he developed an inferiority complex. And he things taking Toono away, without having any feelings for him whatsoever, he'll finally be a winner. ヽ(`Д´)ノ So mad! and I'm really impatient on finding out what happens next.