OVA released with the 9th volume of the manga. 

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Togawa is dating the resident class weirdo, and their relationship is even more non-standard than she expected! They've never even kissed, but he's tasted her tears, cleaned her ears, and shaved the nape of her neck! And also walked her through a Buddhist ritual that opened her third eye and brought her spiritual peace and a good night's sleep. It is indeed a wonder, in more ways than one, that she can't help but feel drawn to him. 
(Source: J-Novel Club)

Takaomi and Arika meet a young girl named Tsugumi Yoshimoto who has been asleep since an incident that occurred when she was a child. What happened in her past? And can she be cured? The couple try to solve this mystery with the help of the Mishima sisters -- Toko and Rinko, who are 'Yumetsukais' (dream messengers) with the uncanny ability to control dreams. What is the truth behind this mystery? 
This is a prelude to Riichi Ueshiba's next work, "Yumetsukai." The Mishima sisters make a comeback as main characters in "Yumetsukai." 
(from Kodan Club)

Two stories from the School Arc of Discommunication that were never included in the main series' volume release.

Riichi Ueshiba's debut work published in Morning No. 24, 1991. Would eventually become Chapter 1 of the main serialization.

Arika Togawa