Heartwarming / Akkan Baby

• When Yuki first meets Puni, and his and Shigeru's general (haphazard but well-meaning) care towards him. Also, the former's Papa Wolf behavior towards Puni when he finds out that Mika intended to abandon him. Likewise, though it's heart-tugging, Mika's reunion with her son.
• Similarly, Shigeru encouraging Mika to find Shigeo, Puni's father.
• Before that, after the whole hospital debacle, we have Yuki buying parenting manuals and promising not to fail at parenting. This perks up Shigeru, and they both agree that they'll succeed at parenting.