Ep. 4: Ayuko befriends Urabe after discovering their shared injury transfer ability through saliva
Aired on April 29, 2012

4
Ayuko sits near Urabe at lunch, surprising others. During PE, Urabe scrapes her knee, and Ayuko treats it at the nurse's office. Sharing a drink causes Ayuko to develop the same injury, revealing that Urabe's saliva transfers wounds. This mirrors the connection between Urabe and Tsubaki. Ayuko admits her fascination with Urabe began when she saw her with Tsubaki, but Mikoto rejects Ayuko's friendship proposal. The following day, Ayuko feeds Urabe her saliva, noting its sweet taste to deduce Urabe has not kissed Tsubaki yet. Consequently, Urabe and Ayuko establish a daily routine of eating lunch together.
Episodes
- Ep. 1 · Mikoto Urabe and Akira Tsubaki bond through her unusual saliva exchange ritual
- Ep. 2 · Tsubaki seeks advice from Kouhei Ueno regarding his relationship with Urabe, leading to a strange encounter.
- Ep. 3 · Tsubaki receives Urabe's saliva to test their romantic connection after witnessing Kouhei with Ayuko.
- Ep. 4 · Ayuko befriends Urabe after discovering their shared injury transfer ability through saliva
- Ep. 5 · Tsubaki asks Urabe to the beach after seeing her swimsuit image through sweat tasting
- Ep. 6 · Tsubaki and Urabe share a drool swap and a photo after a bridge encounter.
- Ep. 7 · Urabe hides a bikini under her coat to cure Tsubaki's cold before the sports festival
- Ep. 8 · Tsubaki’s dream about Urabe leads to an intimate and confusing encounter at her home.