Haru to Ao no Obentoubako

You may be eating alone, but you're not really alone. Today's lunch, homemade just for you, feels like a warm hug. Geeky Haru normally shrugs off the pitying looks of strangers that don't understand her priorities in life, but one day a fluke comment leaves her down in the dumps. That same day, she meets androgynous young Ao. The two of them really hit it off and, on the spur of the moment, decide to become roommates. Except, one of the house rules is a homemade lunchbox exchange...?!

(Source: Coamix)

Included one-shot:
Volume 5: Issho ni Oishiku