You'll Never Be Young Twice - S1.E9

This episode revolves around three people, the first of which is Saki, a pianist. She is determined to make it into a music university, but she just can't make it. Then, Poom Poom gives her a balloon. After she let go of it, she killed herself. Quite a few people are now getting strange phone calls urgeing them to 'Come play with us.' Yoshiki, the one making the calls, gets taken in by Boogiepop Phantom and dissapears.