This really is a story of healing more than anything. This plot could have taken a turn for the worse at any point, a generic "We are fooling around to get over our personal pain" kind of deal. It's what both of them told themselves it was at first too, exactly because they couldn't believe they deserved more. Instead they genuinly love each other and form a solid bond.
Outcasts in several ways, but not actually bad people in any way. Kashiwagi who is treated like the worst delinquent is actually the one with more common sense and emotional stability. Kusumi is in a worse place, but she is also more honest about her feelings. Their dynamic is truly charming and this manga oozes cuteness between the pain. Definitely a far better read than what the tags would imply. Glad I read it.