Disabled 1 day pass - first time booking

[peaceofcak3]

Hi, I'm going to Disney Tokyo in August and I'm eligible for a disabled pass. My partner and I are going together. Do I book 1 disabled ticket and he gets in for free or do I need to book 2 tickets? I don't really understand how the website worded it so, any help would be much appreciated as I don't know how many tickets or which ones I need. Thank you