The Heart of Thomas

The title story features the earlier life of the character Oscar from the manga "Thomas' Heart." Due to many large and small problems that have added up over the years, Oscar's parents' marriage is collapsing. One day, after a fight that Oscar believes is going to end like all of the others, his father does something irreversible. Now Oscar and his father will have to deal with the consequences.

(Source: MangaHelpers) 

*Notes:*
\- Includes the one-shot Shiro (城)
\- Includes the one-shot Egg Stand (エッグ・スタンド)
\- Includes the one-shot "Tenshi no Gitai (天使の擬態; Angel Mimic)"