Sad Girl Hours by Anna Zoe Quirke

Saffron struggles with seasonal affective disorder (SAD) and is dreading autumn and winter. She took time off in her first year at university and can't afford to do the same this year if she's going to achieve her dream of being an astrophysicist. She's managed to keep it a secret from her friends - fearing that they won't want to spend time with her if they see her at her lowest - but it's getting harder.

Especially when she meets Nell. Nell - wannabe poet, autistic and proud, and lover of autumn and winter - is determined to show Saffron everything these seasons have to offer. The two grow close, and when Saffron confides in Nell, romance blooms.

But with Saffron struggling to keep a lid on her mental health and Nell figuring out her own sexual identity, things soon spiral out of control. A dual-perspective sapphic rom-com perfect for fans of Casey McQuiston and Alice Oseman.
 
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"Tender and funny" - Lex Croucher