Time for Al's insecurities and Haruka's social anxiety to come head to head.
Also, "friends" really is a problem when the age gap is that big. The bodies may all be 15, but Haruka still has a mid-40s old man as a core identity, putting them 30 years ahead of the kids. Parent, guardian, caretaker, mentor (insofar as one with "amnesia" can be such), sure, but "friends" is weird.
Even more so when it's the self-described "single, awkward, otaku, scolded by my superiors, disrespected by my juniors, and stuck in the daily grind", because at that point, you're used to keeping people at arm's length and then some.