[Spoilers for the game below]-----------------------------------
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Ogata's route is quite difficult, and unless you choose just the right options when you bump into him in the hallway, you really need to be mean to Yuusaku a couple of times, either by ignoring him or refusing the pamphlet (or even telling him to fuck off if you don't mind failing the party planning part of t he game). Doing this will tip you over into enough points to continue Ogata's route after the dentist's office into the third weekend. Consult the hint sheet for exact dialogue options to choose if you don't mind being spoiled on them and/or are getting pretty frustrated and just need a couple hints.
Thank you for your patience with my delay in replying and for playing the game!!! <3