I came across this today in my travels & decided what the heck- it sounded pretty cute. A manga full of grins later, I'm glad that I took the time to read this volume. It has to be one of the cuter ones I've seen lately that isn't on the cutesy side. 
 Daikichi is a 30 year old bachelor that has been going about his life as always until the day his grandfather dies. He goes to show his respects, only to discover that his grandfather had a life he'd never suspected. His grandfather had a mysterious mistress that is nowhere to be seen, the only evidence of which is the shy child Rin. Daikichi's other family members treat her as if she was an embarrassment, but it is only Daikichi that volunteers to care for this girl when everyone else comes up with nothing but excuses. Little does he know that taking in little Rin will be one of the most challenging & rewarding tasks he's ever set upon. 
 I really enjoyed this manga. I loved that all of the characters were so realistic in their portrayals. Daikichi isn't some manga heartthrob, nor does he suddenly start raking in the ladies as soon as he adopts Rin. There is a hint of a possible future romance, but by large the manga focuses on the growing parent/child relationship between the two main characters. I also liked that despite the heartwarming & cute moments, that this manga didn't try to go for the cliche cute that seems to abound in many mangas nowadays. 
 If you really want to read something that'll make you glad to have read it by the last page, then you definitely want this manga. It's one that I anticipate collecting every volume for.