Because...this is a spin-off about him. Minori no Te is where he first appeared ╮(￣▽￣)╭
So I wasn't the only one
And Tatsuyuki says Minori's name several times, thinks about him, imagines he sees him, tells Nozomi about him, Nozomi offers to be Minori's surrogate. All kind of give it away.
Yeah. It would be weird for those who read both to NOT notice ╮(￣▽￣)╭
yes you're right i actually saw it before!
Was I the only one that noticed how tastuyuki also featured in the authors other manga "minori no te" where minori sensei massaged him.