[ Midorima started off his birthday getting ambushed and invaded by Eichi and his whims. One thing that Tsumugi may have noticed was the addition of a grand piano to their living area. He wouldn't fess up how he found out about Midorima's birthday, but Midorima partially suspects Tsumugi.
Thankfully, Tsumugi does have some leeway as he's the person Midorima gets along with best, whether his suspicions are true or not. He'll deal with Eichi in his own way. ]
Maybe.
[ Despite that, it's not like he's.. far. He's already come home since he can't really afford to do much and is having the worst tsundere relationship with this piano because he wants to play but he doesn't want to give Eichi the satisfaction. So he ends up peeking into the kitchen after a few seconds anyway.. ]
Re: backdated to his bday, whoops
Thankfully, Tsumugi does have some leeway as he's the person Midorima gets along with best, whether his suspicions are true or not. He'll deal with Eichi in his own way. ]
Maybe.
[ Despite that, it's not like he's.. far. He's already come home since he can't really afford to do much and is having the worst tsundere relationship with this piano because he wants to play but he doesn't want to give Eichi the satisfaction. So he ends up peeking into the kitchen after a few seconds anyway.. ]