A very sweet and innocent story about a 1st year and 3rd year high school student who find themselves attracted to each other and having to come to terms with those feelings.
Sequel: Sono Koi Ni Wa Wake Ga Aru
http://www.mangago.me/read-manga/sono_koi_ni_wa_wake_ga_aru/
Hito Wa Sore O Koi To Yobu