Ok, guys, my admiration of Masato is reaching new heights right now. While paying attention to Masato’s actions for the “keeping secrets” assumption, I noticed just how thoroughly Masato is supporting Riki.
I’ve re-read Rin1, Mio so far and I’m currently in the middle of Komari’s route, and these things happened:
In Mio’s route, after the beach scene, Riki forgets about Mio. While packing his bag for class, he can’t find a particular textbook, so he starts rummaging around his stuff to find it, stumbles upon Mio’s favorite book instead and regains his memories of Mio.
So, why was Riki’s textbook missing in the first place?
As a little extra, a few days earlier, while Mio was still around but people started forgetting her - even Kud, who was her roommate on my playthrough. Next day, people are still forgetting Mio and Riki is visibly upset. Then Masato marches in and greets Mio like normal. Riki said that made his day.
In Komari’s route, when Riki is trying to figure out Komari’s dream about her brother with “white fluttery things” on a roof, Masato just so happened to break his expander so that it would hit his tea bottle and spill the tea over his sheets. He then asked RIki to go hang it out. And then Riki, seing the hung out white sheet flutter in the wind, realized what Komari meant by white fluttery things in her dream!
So turns out Masato’s support isn’t limited to blurting out secrets, just making Riki feel good, giving him (and his girl) some space when needed, or taking care of chores (like burying dead kittens) so Riki can focus on the challenges he’s facing. It seems to me that Masato is actually secretly following Riki around, actively keeping track of what the problem is so that he can secretly help him in making progress.
I imagine this to be an extremely difficult thing for him to do, and on top of that, he’s even stealthier than Kyousuke when he does it!