For a [[AfterTheEnd post-apocalyptic]] {{manga}} series featuring the last days of humanity, ''Manga/{{Ai-Ren}}'' contains a surprisingly amount of HeartwarmingMoments, to the point where you can call this a Crowning Manga of Heartwarming.

Several of these HeartwarmingMoments are the following...
* Nearly all of Ikuru and Ai's "moments" together qualify for this trope.
* "It's okay. Ai is still here." Then the scene with the tomato plant right after.
* The whole of Chapter 35.5.
* The EnfanteTerrible Ikuru carries outside the dome. He cries... [[spoiler: [[TearJerker and dies soon after.]]]]
* Chapter 43: [[spoiler: Dad... Mom... Thank you for letting me be born ♥]]