My Girlfriend Is a Colossal Cutie Vol 2

From the Yen Press edition

From study sessions to secret movie dates, Amane is loving large with his ultra-adorable and gigantic cutie of a girlfriend! The only little hiccup to their perfect romance is making sure their relationship isn’t discovered...except for some reason, Obitani’s friend gets the wrong idea about who she likes and is trying to set her up with another guy...!

Source: Yen Press