Oikawa's Voicemails

Almost every weekend, Oikawa sends Iwaizumi drunk voicemails. Iwaizumi tells Oikawa which leads him not to talk to Iwaiumi as much. As Iwaiumi misses his best friend, he starts to get a feeling for Oikawa. However, from the drinking, Oikawa has been doing, without Iwaizumi knowing, Oikawa grows a sickness.