Naisho no Tsubomi
Tsubomi's Secrets ／ Tsubomis Geheimnis ／ Секрети Цубомі ／ ないしょのつぼみ ／ 少女的秘密心事 ／ 秘密的花蕾
Description
Tsubomi Tachibana is a fifth grader dealing with rather sensitive issues such as her mother's pregnancy, her first period and the strange feelings she has started to get when she has been around boys. (Source: Anime News Network)