I'm a little confused (I haven't finished the whole thing btw) but what exactly is the relationship between the brothers and the grandma? They're not her biological grandchildren right? She states that many times and her son looks nothing like their father so what's happening?
Basically Granny lost her son and his wife on the same flight that Ryuu and Kotaro lost their parents. So she adopted the two of them and one of Ryuu's requirements to be with granny and going to school and all was to be the day care helper cause no students ever sign up. In some moments Granny reminisces about her son and daughter in law vicariously through what Ryuu and Kotaro are doing
Maybe I'm missing something but shouldn't the sensei and Ryuu already know each other since Yuuto asked Ryuu to find someone for Komatsu?
Ryuu probably asked one of his partners if they knew someone suitable, since he himself only chooses partners that aren't serious. So sensei is a friend of a friend, most likely
at least you know he's not in it for the money
Yea but he's in for a pet nephew.
Prepare your body and stamina nephew kun, your uncle would ask for a session of night yoga and cardio exercises from now on.
Night yoga (≧∀≦)