The OVA previously got a DVD only release on December 3rd, 2014 which and hasn’t seen any further licensing since then.
Under the name This Boy Suffers from Crystallization, Kuma Holdings now has Soubi Yamamoto’s Kono Danshi, Sekika ni Nayandemasu OVA up for sale on iTunes and Amazon where the former has both dub and sub and the latter just the dub.
Crunchyroll is streaming the subtitled version of the OVA is for their members in the US, Canada, UK, Ireland, Australia, and New Zealand.
This Boy Suffers from Crystallization - English Dub Trailer (Available on Digtial & Disc)