Boku to Watashi no 10-nen Koi

Tooru is a 5th grader who has always been in love with Nagisa, his next door neighbour who is a high school student. "I'll definitely get her to look at me." ...is what Tooru thinks but Nagisa only sees Tooru as a little brother. This is a frustrating yet charming story spanning over 10 years about two people with a five years age gap. Note: First released on an online magazine with 54 chapter, the tankoubon version has 12 larger one + 11 extras.