サクラ、サク。 [Sakura, Saku.] Series by Io Sakisaka

Saku Fujigaya would like to thank the boy who helped her, but all she has is a note signed “Ryosuke Sakura.” She discovers that a boy at her high school, Haruki Sakura, has an older brother named Ryosuke. She asks Haruki to deliver her thank-you letter to Ryosuke, but why does he refuse?

Saku has her long-awaited meeting with Ryosuke, only to discover he wasn’t the person who helped her. Learning that her feelings for him were based on a misunderstanding comes as a shock. Saku finds herself drawn to Haruki, who has been supporting her all along, but how can she take the next step when she isn’t even sure what love is anymore?

Now that Saku realizes she’s in love with Haruki, she finds her heart racing for a new reason every day—until Haruki and Kotono start pretending to be a couple to protect Kotono from her ex-boyfriend. Then the blunt-speaking Iryu gets involved in Saku’s life, causing even more trouble!

Now that Saku knows Kotono might like Haruki too, she doesn’t know what to do. Distressed, Saku is embraced by Iryu, who helps hide her from prying eyes. Saku discovers that Iryu’s cold, blunt manner conceals surprising kindness, and she gradually begins to warm to him...

Saku’s feelings for Haruki are more powerful than ever. After opening up to Kotono, the misunderstanding between the two friends has been resolved. But when Saku finds out that Iryu might be the guardian angel who saved her years ago, the relationships among these friends begin to change…