From Day of the River:

Sayo and Nao are childhood friends and neighbours, but Sayo has been in love with Nao for years. With Nao being a year older than her, Sayo finds it difficult to confess her love for him because she believes he only sees her as a little sister. But when Nao tells her he's moving away, it's now or never...!

Also contains the story Cosmic Wonder - Fate's Twin.

From Day of the River: Towards the boys who do not understand her inner self and only say they like her for her appearance, she absolutely hates them. Especially her homeroom teacher, who ticks her off even more. But how come...? In addition, there are four more love stories in this debut collection!

From Keijo Shoujo Scans:

Sumire is habitually indecisive. Kei is brutally straightforward. And so begins a sweet, high school love story.